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  • 151.
    Hedenström, Erik
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Högberg, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Wassgren, A.-B.
    Bergström, G.
    Löfqvist, J.
    Hansson, B.
    Anderbrant, O.
    Sex Pheromone of Pine Sawflies: Chiral Syntheses of some Active Minor Components Isolated from Neodiprion sertifer and of some Chiral Anologues of Diprionyl Acetate1992In: Tetrahedron, ISSN 0040-4020, Vol. 48, no 15, p. 3139-3146Article in journal (Refereed)
  • 152.
    Hedenström, Erik
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Nguyen, Ba-Vu
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Silks III, L. A.
    Do enzymes recognise remotely located stereocentres?: Highly enantioselective Candida rugosa lipase-catalysed esterification of the 2- to 8-methyldecanoic acids2002In: Tetrahedron: asymmetry, ISSN 0957-4166, E-ISSN 1362-511X, Vol. 13, no 8, p. 835-844Article in journal (Refereed)
    Abstract [en]

    Several racemic methyl decanoic acids have been synthesised and successfully resolved in esterification with 1-hexadecanol at aw=0.8 in cyclohexane using immobilised Candida rugosa lipase (CRL) as the catalyst. The enantiomeric ratios (E=2.8-68) obtained were surprisingly high even when the methyl group was as remotely located as in 8-methyldecanoic acid (E=25). Interestingly, the lipase shows enantiopreference for the S-enantiomer when the methyl group is located on even numbered carbons i.e. for the 2-,4-,6- and 8-methyldecanoic acids and to the R-enantiomer when the methyl group is located on uneven numbered carbons i.e. for the 3-,5- and 7-methyldecanoic acids.

  • 153.
    Hedenström, Erik
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    Wallin, Erika
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    Andersson, J
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    Bång, Joakim
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Wang, H-L
    Department of Biology, Lund University, Sölvegatan 37, Lund, Sweden .
    Löfstedt, C
    Department of Biology, Lund University, Sölvegatan 37, Lund, Sweden .
    Brattström, O
    Department of Zoology, Cambridge University, Cambridge, United Kingdom.
    Baquet, P
    Evolutionary Ecology and Genetics group, Biodiversity Research Centre, Earth and Life Institute, Académie Louvain, Croix du Sud 4, Louvain-la-Neuve, Belgium.
    Stereoisomeric Analysis of 6,10,14-Trimethylpentadecan-2-ol and the Corresponding Ketone in Wing Extracts from African Bicyclus Butterfly Species2015In: Journal of Chemical Ecology, ISSN 0098-0331, E-ISSN 1573-1561, Vol. 41, no 1, p. 44-51Article in journal (Refereed)
    Abstract [en]

    Gas chromatography (GC) and mass spectrometry (MS) were used to determine the stereoisomeric compositions of 6,10,14-trimethylpentadecan-2-ol and 6,10,14-trimethylpentadecan-2-one in wing extracts from 17 Bicyclus butterfly species from different regions of Africa. All samples were purified using solid phase extraction (SPE). Since some species contained both alcohol and ketone, these were separated and the ketone was reduced to the alcohol before analysis as either (R)-trans-chrysanthemoyl or (S)-2-acetoxypropionyl esters. A novel asymmetric synthesis was developed for a reference mixture of (2R/S,6S,10R)-6,10,14-trimethylpentadecan-2-ol with known composition of the eight stereoisomers. The mixture then was used as the (R)-trans-chrysanthemoyl esters to correlate each of the eight gas chromatographic peaks to a specific stereoisomer of the extracted wing compounds. Seven butterfly species showed (2R,6R,10R)-configuration of the alcohol, four species contained minute amounts of alcohol too small to determine the stereochemistry, nine species showed (6R,10R)-configuration of the ketone, and one species contained minute amounts of ketone too small to determine the stereochemistry. No other stereoisomers of alcohol or ketone could be detected in the extracts, and the quantities of the compounds in the wing extracts varied from 5 to 900 ng per sample for each species.

  • 154.
    Hellström, Lisbeth
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    Carlberg, Torbjörn
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    Engstrand, Per
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    Gradin, Per
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    Gregersen, Øyvind
    Department of chemical engineering, NTNU, Norway.
    Collimated chipping technology in order to reduce the energy consumption in mechanical pulping2011In: Proceeding for International Mechanical Pulping Conference, Xi'an, P.R. of China, 2011, p. 457-460Conference paper (Other academic)
    Abstract [en]

    It has recently been shown that it is possible to improve the energy efficiency during first stage TMP (thermomechanical pulp) refining by utilizing a modified chipping method (collimated chipping). A patent application regarding this method has been filed and is pending. The modification consists in that the spout angle i.e. the angle between the fibre direction of the wood specimen and the cutting plane, is increased. This paper reports the differences in properties of IMP refined from chips produced at two different spout angles i.e. 30 and 50 with and without the addition of sodium bisulphite (NaHSO3) to the dilution water. It was found that the specific energy input for a certain CSF (Canadian Standard Freeness) value was lower for chips produced at spout 50 but that the addition of chemicals to the dilution water had no influence on the specific energy value for a given CSF value. However, the tensile index and specific light scattering coefficient was substantially higher for handsheets made of the pulp refined from chips produced at spout angle 50 and with NaHSO3 added compared to handsheets from pulp made from 30 and 50 chips without chemicals added.

  • 155.
    Henschel, Till
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Fuel flexibility for gasification: Analysis and evaluation of different biomass2015Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The objective of this degree project has been to apply different methods of analysis to evaluate a variety of feedstock. The application of different feedstock can increase the fuel flexibility of gasification reactors and therefore increase their profitability. The syngas produced through gasification is important for the production of electricity, different chemicals and biomass to liquid fuels. It has further been the aim to analyse potential correlations between the gas composition and tar yields of gasification and pyrolysis processes. The study is based on the experimental analysis of the properties of hemicellulose, cellulose, lignin, spirolina, scenedesmus quadricauda, pine bark, peat, forest residues, straw, hemp, black liquor, sawdust and wood. These biomass feedstocks have been analysed by pyrolysis, proximate, thermogravi-metric, gas, partially ultimate and gasification analysis. The results of the fuel analysis of wood, sawdust, forest residue and pine bark indicate a good pyrolysis and gasification potential. Microalgae, may be more suitable for other chemical processes but could as well as peat be used as an additive for gasification. Black liquor is unsuitable for unpressur-ised gasification. The thermogravimetric analysis of varying fuel frac-tions of peat and forest residues indicates a predictability of the result-ing mass loss curves. The measured gas and tar yields of the gasification and pyrolysis experiments reveal that correlations between the two different processes partially exist. A possible correlation between me-thane and tar yields could be observed as well. It is recommended to conduct further experiments including ash analysis and construction of a drop tube reactor.

  • 156. Herz, Annette
    et al.
    Heitland, Werner
    Anderbrant, Olle
    Edlund, Helen
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Hedenström, Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    First use of pheromones to detect phenology patterns and density relationships of pine sawflies in German forests2000In: Agricultural and Forest Entomology, ISSN 1461-9555, E-ISSN 1461-9563, Vol. 2, no 2, p. 123-129Article in journal (Refereed)
    Abstract [en]

    1 Monitoring studies of pine sawflies with pheromone traps were performed for the first time in Germany. Pheromone traps baited with species-specific pheromone substances were installed in pine forests at different locations in Bavaria, Brandenburg and Lower Saxony during two years. 2 It was possible to track the flight phenology of Diprion pini, Gilpinia pallida and Neodiprion sertifer reliably and to get information about the number of generations of these species in 1997 and 1998. 3 A clear relationship between trap catch and population density could not be detected, but qualitative changes in trap catch caused by different density levels were observed. 4 For D. pini, trap catches were different among endemic populations of different forest types. Furthermore, catches of males reflected the results from the regular cocoon collections by foresters during the previous winter. 5 For N. sertifer, trap catches in endemic populations were well separated from trap catches on sites with higher sawfly densities. However, no significant correlation between trap catch and sawfly density or defoliation level could be found. These results suggest that the efficacy of the pheromone traps probably varied with biological features (sex ratio, density level, immigration) of the particular population.

  • 157. Hillbur, Ylva
    et al.
    Andersson, Peter
    Arn, Heinrich
    Bengtsson, Marie
    Löfqvist, Jan
    Biddle, Anthony J.
    Smitt, Olof
    Högberg, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Plass, Ernst
    Franke, Stephan
    Francke, Wittko
    Identification of sex pheromone components of the pea midge, Contarinia pisi (Diptera: Cecidomyiidae)1999In: Naturwissenschaften, ISSN 0028-1042, Vol. 86, no 6, p. 292-294Article in journal (Refereed)
  • 158. Hjalmarsson, Mats
    et al.
    Högberg, Hans-Erik
    Synthesis of (R)- and (S)-10-Methyldodecyl Acetate, Sex Pheromone Components of the Smaller Tea Tortrix Moth (Adoxyphyes sp.), from Chiral Synthons Prepared via Asymmetric Synthesis.1985In: Acta Chemica Scandinavica Series B, ISSN 0302-4369, Vol. 39, no 9, p. 793-796Article in journal (Refereed)
  • 159. Hoffland, Ellis
    et al.
    Kuyper, Thomas W
    Wallander, Håkan
    Plassard, Claude
    Gorbushina, Anna A
    Haselwandter, Kurt
    Holmström, Sara
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Landeweert, Renske
    Lundström, Ulla S
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Rosling, Anna
    Sen, Romin
    Smits, Mark M
    van Hees, Patrick A W.
    Man-Technology-Environment Research Centre, Dept of Natural Sciences, Örebro University, Örebro, Sweden .
    Nico van Breemen, Nico
    The role of fungi in weathering2004In: Frontiers in Ecology and Environment, ISSN 1540-9295, Vol. 2, no 5, p. 258-264Article in journal (Refereed)
    Abstract [en]

    No rock at the Earth’s surface escapes weathering. This process is the primary source of all the essential elements for organisms, except nitrogen and carbon. Since the onset of terrestrial life, weathering has been accelerated under the influence of biota. The study of biological weathering started at the end of the 19th century. Although the role of bacteria (Eubacteria, Archaea) has attracted a lot of interest, until recently the role of fungi has largely been neglected. More recently, however, fungal weathering has become an increasingly important focus of biogeochemical research.

  • 160. Holmberg, E
    et al.
    Holmquist, M
    Hedenström, Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Berglund, Per
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Norin, Torbjörn
    Högberg, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Hult, K
    Reaction Conditions for the Resolution of 2-Methylalkanoic Acids in Esterification and Hydrolysis with Lipase from Candida cylindricea1991In: Applied Microbiology and Biotechnology, ISSN 0175-7598, Vol. 35, no 5, p. 572-578Article in journal (Refereed)
  • 161.
    Holmström, Sara
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Siderophore promoted dissolution of goethite: Effects of Mn substitution2006In: The 232nd ACS National Meeting San Francisco, CA, USA, September 10-14, 2006, 2006Conference paper (Refereed)
  • 162.
    Holmström, Sara
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Structure and reactivity of bacteriogenic Mn oxides exposed at different pH2006In: The 232nd ACS National Meeting San Francisco, CA, USA, September 10-14, 2006, 2006Conference paper (Refereed)
  • 163.
    Holmström, Sara
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Systematic study of the effect of pH on the structure and reactivity of Mn oxide produced by Bacillus sp., strain SG-12006In: XAFS13, Stanford University, Stanford, CA, USA. July 9-14, 2006, 2006Conference paper (Refereed)
  • 164.
    Holmström, Sara J M
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Organic acids and siderophores in forest soil solution2003Doctoral thesis, comprehensive summary (Other academic)
  • 165.
    Holmström, Sara J M
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Lundström, Ulla S
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    van Hees, Patrick A. W.
    Finlay, Roger D
    Siderophores in soil solution and their production by an ectomycorrhizal fungus.2001In: Proceedings. 8th Nordic IHSS Symposium on humic substances - characterisation, dynamics, transport and effects. 28-30 May 2001, Fredriksberg, Denmark, International Humic Substances Society, Nordic Chapter , 2001Conference paper (Other academic)
  • 166.
    Holmström, Sara J M
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Lundström, Ulla
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Van Hees, Patrik A. W.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Finlay, Roger D
    Siderophores in soil solution and production by an ectomycorrhizal fungus.2002In: Proceedings. First European Workshop on Mineral Weathering by Fungi. Wageningen, The Netherlands, 17-19 October 2002, 2002Conference paper (Other academic)
  • 167.
    Holmström, Sara J. M.
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Sposito, G
    Siderophore promoted dissolution of a series of Mn-substituted goethites: AGU (American Geological Union) 2005 Fall Meeting San Francisco, USA, 5-9 December 2005; Oral presentation2005Conference paper (Refereed)
  • 168.
    Holmström, Sara
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Lundström, Ulla
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Finlay, Roger
    van Hees, Patrick
    Siderophores in forest soil solution2004In: Biogeochemistry, ISSN 0168-2563, E-ISSN 1573-515X, Vol. 71, no 2, p. 247-258Article in journal (Refereed)
    Abstract [en]

    Siderophores in soil solution of coniferous forest soils have been chemically identified for the first time. We have identified the siderophores ferrichrome and ferricrocin in soil solution of the upper organic layer by High Performance Liquid Chromatography Mass Spectrometry (HPLC-MS). The soil solutions were sampled from mor layers of podzolic soils from the south and the north of Sweden and from a mor layer overlying granitic rock and intensively colonised by ectomycorrhizal hyphae. Ferrichrome was found in nanomolar concentrations in all soil solutions investigated and ferricrocin only in the soil solution from the mor layer covering a rock and in the soil solution from the north of Sweden. The findings are discussed in relation to the possible role of fungal hyphae and siderophores in weathering minerals in podzolic soils under coniferous forests. Citric and oxalic acid are able to dissolve minerals via complexation of cations from the mineral. Siderophores should be, kinetically and thermodynamically even more efficient complexing agents for trivalent cations than oxalic and citric acid. The present study provides direct for presence of siderophores in soil solution.

  • 169.
    Holmström, Sara
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Norrman, S.A.
    Lundström, Ulla
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    van Hees, P.A.W.
    Essén, Sofia
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Siderophores in Soil Solution: 9th Nordic IHSS Symposium on Humic Substances - Abundance and functions of natural organic matter species in soil and water; Sundsvall 2003-05-19-2003-05-212003Conference paper (Other scientific)
    Abstract [en]

    Siderophores in soil solution of coniferous forest soils have been chemically identified. The siderophores ferrichrome and ferricrocin were identified in soil solution of the upper organic layer and also in the liquid medium of a cultivated ectomycorrhizal fungus by High Performance Luquid Chromatography Mass Spectrometry (HPLC-MS).

  • 170.
    Holmström, Sara
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Riise, Gunnhild
    Tau Strand, Line
    Geibe, Christine
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Van Hees, Patrick
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Wu, Qinglan
    Lundström, Ulla
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Effects of lime and ash treatments on DOC fractions and low molecular weight organic acids in soil solutions of acidified podzolic soils2003In: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 3, no 4, p. 97-120Article in journal (Refereed)
    Abstract [en]

    Dissolved organic carbon (DOC) fractions and different low molecular weight organic acids (LMWOAs) were determined in soil solutions from two lime or ash treated Norway spruce sites in the south of Sweden. At Hasslöv, 3.45 t ha-1 or 8.75 t ha-1 dolomite were applied 15 years before sampling. Horröd was treated with 4.28 t ha-1 ash and 3.25 t ha-1 dolomite and sampled four years later. Propionate (7–268 M) and malonate (2–34 M) were the LMWOAsfound in the highest concentrations at Hasslöv. Two other LMWOAs dominated at Horröd, namely citrate (18–64 M)and fumarate (5–31 M). The differences in concentration of most of the determined LMWOAs at Hasslöv were significantly increased due to treatment. The LMWOAs comprised between 1.1–6.3% of the DOC at Hasslöv and 4.5–17.6% at Horröd. At Hasslöv normally 3–10% of the total acidity (TA) was due to LMWOAs and the average specific buffer capacity was 74 ± 22 mmol mol-1C.The total DOC concentration in the mor layer solution was 16 mM for the dolomite treated plots compared to 10 mM at the untreated plot. A major part of the increase in DOC at the treated plots apparently had a hydrophobic character and was of high molecular weight corresponding to 3–10 kDa. The concentration of DOC < 1 kDa in the control and treated plots was similar.

  • 171.
    Holmström, Sara
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    van Hees, Patrick
    Lundström, Ulla
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Modelling of aluminium chemistry in soil solution of acidified and lime treated podzolic soil2004In: Geoderma, ISSN 0016-7061, E-ISSN 1872-6259, Vol. 127, no 3-4, p. 280-292Article in journal (Refereed)
    Abstract [en]

    Soil solutions were taken from untreated and lime treated Norway spruce sites in the south of Sweden. At the limed sites 3.45 t ha−1 (L) or 8.75 t ha−1 (H) dolomite were applied 15 years before sampling. The mean concentration of inorganic Al (AlQR) in the untreated control plots (C) was 37 μM and the concentration of AlQR decreased when the dosages of dolomite treatments increased. For the H plots, with high doses of dolomite treatment the mean concentration of AlQR was 17 μM. The total Al (Altot) also decreased by dolomite treatment, from 72 μM to 56 μM. Propionate (7–268 μM) and malonate (2–34 μM) were the low molecular weight organic acids (LMWOAs) found in the highest concentrations at Hasslöv. The differences in concentration of most of the determined LMWOAs were significantly increased due to treatment. The citrate average concentration for the different plots varied between 2.8 μM and 5.1 μM and the concentration of oxalate had concentrations between 1.7 μM and 2.6 μM. The experimental concentration of Al bound to LMWOAs obtained by ultrafiltration (<1000 Da) of the soil solution was in the mor layer on average 12% for the C plot and the L plots and 4% in the H plots. In the AE horizon the figures were 15% for the C plot and about 7% for the treated L and H plots, and in the Bhs horizon 9% for both the C, L and H plots. Two chemical equilibrium models were evaluated: Winderemere Humic Aqueous Model (WHAM) and a model treating the high molecular weight organic acids as monoprotic. The concentrations of inorganic Al, Al bound to identified LMWOAs and high molecular weights acids in soil solution (mor, AE and Bhs) from untreated and lime treated soil were calculated. The modelled inorganic Al values of the control plot were similar to the concentrations found in the soil solution (AlQR). For the dolomite treated plots the concentration of AlQR (0–40 μM) was higher in soil solution than that modelled by WHAM and the monoprotic model. The experimental concentration of Al bound to LMWOAs obtained by ultrafiltration (<1000 Da) of the soil solution was comparable but always higher than the modelled values. The modelling confirms that an appreciable part of the Al is strongly complexed with LMWOAs in the organic and eluvial horizons of the podzolized soil, suggesting that LMWOAs are efficient weathering agents and important for the formation of the eluvial horizon in podzols. Saturation indices (SI) for two solid Al phases were also calculated, including crystalline gibbsite and proto-imogolite (PI). The SIs for both the C and the treated plots (L and H) showed very broad ranges for the different horizons investigated, indicating undersaturation as well as oversaturation with respect to gibbsite and proto-imogolite.

  • 172. Hongve, D.
    et al.
    Van Hees, P.A.W.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Lundström, Ulla
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Dissolved components in precipitation water percolated through forest litter2000In: European Journal of Soil Science, ISSN 1351-0754, E-ISSN 1365-2389, Vol. 51, no 4, p. 667-677Article in journal (Refereed)
    Abstract [en]

    Leaves lying on the forest floor are a major source of dissolved organic substances in soil and surface waters, and these substances have important effects in those environments. We used zero-tension lysimeters to study the chemical characteristics of water percolating through litter from various species of forest trees. The leaching rates were greatest in the autumn and declined rapidly thereafter, especially for deciduous litter. During an annual cycle, 2.5-17% of the initial contents of the carbon in the litter was recovered as dissolved organic carbon in percolates. Humus-like substances, hydrophilic acids and hydrophilic neutral compounds constituted the major fractions of dissolved C. Leachates from deciduous leaf litter were only partly biodegradable, and those from spruce needles were scarcely biodegradable. Low molecular weight organic acids constituted 0-12% of the dissolved organic carbon in the percolates of the first autumn sampling and decreased over time. Acetic and formic acids were present at the largest concentrations, up to 30 μmol 1-1 per g litter, and gluconic, pyruvic, fumaric, oxalic and citric acids were also frequent in significant concentrations. Among the aromatic acids, ρ-hydroxybenzoic acid was identified in four out of five autumn samples. The organic components in litter leachates are important for the microbial activity in soil and surface waters. The organic acids enhance weathering and translocation of metals by their ability to form complexes. Litter is also a source of inorganic ions in soil solutions. The dominant cations in the percolates were K+, Ca2+ and Mg2+, and spruce litter also yielded large quantities of Al and Fe.

  • 173.
    Högberg, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Alkylation of Amide Enolates1995In: Methoden der organischen Chemie : Additional and supplementary volumes of the 4th edition ; Vol. E21, Stereoselective synthesis, 1995, p. 791-915Chapter in book (Other scientific)
  • 174.
    Högberg, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Approaches to 2-Methylalkanols of High Enantiomeric Purities via Enzyme mediated reactions.1992In: Microbial Reagents in Organic Synthesis: NATO Advanced Research Workshop on Microbial Reagents in Organic Synthesis (Sestri Levante : 1992), Dordrecht: Klüwer Academic Publishers , 1992, p. 399-410Conference paper (Other scientific)
  • 175.
    Högberg, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Biosignal and Organic Chemistry: IOBC wprs Working Group Meeting - The Scanian Journey. Pheromones and Other Semiochemicals in Integrated Production. Lund, September 9-14, 2007. Lecture2007Conference paper (Other scientific)
    Abstract [en]

    The role of organic Synthesis in the Mistra-program Biosignal.

  • 176.
    Högberg, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Ekologisk kemi: Enantioselektiv syntes av några seskvi och diterpener: 20:e Organikerdagarna, 12-15 juni 2006, Plenary lecture2006Conference paper (Other scientific)
  • 177.
    Högberg, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    Exploiting enantioselectivity of hydrolases in organic solvents2008In: Organic Synthesis with Enzymes in Non-Aqueous Media, Weinheim: Wiley-VCH Verlagsgesellschaft, 2008, p. 73-112Chapter in book (Other academic)
    Abstract [en]

    In modern organic chemistry the synthesis of chiral enantiopure compounds is an extremely important objective. To achieve this, biocatalysts have emerged as key tools. The broad reactivity of hydrolytic enzymes combined with their ability to discriminate between enantiomers make them ideal catalysts for resolving racemic organic compounds to provide enantiomerically enriched products. This chapter gives an overview of how the enantioselectivity of hydrolases can be exploited to furnish virtually enantiopure compounds via kinetic resolution of racemic compounds and desymmetrisation of symmetric compounds. Enantioselectivity and E-values are discussed. Reversibility of hydrolase-catalysed reactions and how it can be avoided by using various irreversible acyl donors as well as the determination and optimization of enantioselectivity are briefly discussed. The bulk of the chapter consists of selected examples of hydrolase catalysed reactions of some important classes of compounds. Thus the usefulness of hydrolase-catalyzed reactions is demonstrated by several examples of reactions in organic solvents of primary, secondary, tertiary alcohols, various amines, and acid derivatives.

  • 178.
    Högberg, Hans-Erik
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Berglund, Per
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Edlund, Håkan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Fägerhag, Jonas
    Hedenström, Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Lundh, Mårten
    Nordin, Ove
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Servi, S
    Vörde, Carin
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Biocatalysis As A Useful Tool In Pheromone Synthesis: Enantiomerically Pure Building-Blocks From Bakers-Yeast Reductions And Enzyme-Catalyzed Resolutions1994In: Catalysis Today, ISSN 0920-5861, Vol. 22, no 3, p. 591-606Article in journal (Refereed)
  • 179.
    Högberg, Hans-Erik
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Edlund, Håkan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Berglund, Per
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Hedenström, Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Water Activity Influences Enantioselectivity in a Lipase Catalysed Resolution by Esterification in an Organic Solvent1993In: Tetrahedron: Asymmetry, ISSN 0957-4166, Vol. 4, no 10, p. 2123-2126Article in journal (Refereed)
  • 180.
    Högberg, Hans-Erik
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Hedenström, Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Fägerhag, Jonas
    Servi, S
    Enantioselective Synthesis Of (S)-2-Methyl-1-Alkanols Via Bakers-Yeast Mediated Reduction Of Alpha-Methyl-2-Thiophenepropenals1992In: Journal of Organic Chemistry, ISSN 0022-3263, Vol. 57, no 7, p. 2052-2059Article in journal (Refereed)
  • 181.
    Högberg, Hans-Erik
    et al.
    Högskolan i Sundsvall / Härnösand.
    Hedenström, Erik
    Isaksson, R
    Wassgren, A.-B.
    Preparation of the Four Stereoisomers of Chalcogran, Pheromone Component of Pityogenes chalcographus and of both Enantiomers of γ-Caprolactone, Pheromone Component of Trogoderma granarium.1987In: Acta Chemica Scandinavica Series B, ISSN 0302-4369, Vol. 41, no 9, p. 694-697Article in journal (Refereed)
  • 182.
    Högberg, Hans-Erik
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Hedenström, Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Nordin, Ove
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Enantioselective Transesterifications of 2-Methyl-1-alcohols Catalysed by Lipases from Pesudomonas1994In: Tetrahedron: Asymmetry, ISSN 0957-4166, Vol. 5, no 5, p. 785-788Article in journal (Refereed)
  • 183.
    Högberg, Hans-Erik
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Hedenström, Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Wassgren, A.-B.
    Hjalmarsson, Mats
    Bergström, Gunnar
    Löfqvist, Jan
    Norin, Torbjörn
    Synthesis and Gas Chromatographic Separation of the eight Stereoisomers of Diprionol and their Acetates, Components of the Sex Pheromone Pine Sawflies1990In: Tetrahedron, ISSN 0040-4020, Vol. 46, no 8, p. 3007-3018Article in journal (Refereed)
  • 184.
    Högberg, Hans-Erik
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Larsson, Michael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Diasteroselective Addition to Chiral Racemic 2-Methylaldehydes using Organozinc Reagents.: Poster och Abstrakt, 18:e Organikerdagarna, Mitthögskolan, Sundsvall.2002Conference paper (Other academic)
  • 185.
    Högberg, Hans-Erik
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Larsson, Michael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Pherodip: Third coordination meeting, Freising, Munchen, Germany, deltagande.1997Conference paper (Other academic)
  • 186.
    Högberg, Hans-Erik
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Lindmark, Marica
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Isaksson, Dan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Sjödin, Kristina
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Franssen, M
    Jongejan, H
    Wijnberg, J
    de Groot, A
    Formation of hemiacetal esters in lipase-catalysed reactions of vinyl esters with hindered secondary alcohols2000In: Tetrahedron Letters, ISSN 0040-4039, E-ISSN 1359-8562, Vol. 41, no 17, p. 3193-3196Article in journal (Refereed)
  • 187. Högberg, Hans-Erik
    et al.
    Wennerström, O
    Synthesis of Some Bicyclophanes.1982In: Acta Chemica Scandinavica, B-Organic chemistry and biochemistry, ISSN 0302-4369, Vol. 36, no 10, p. 661-667Article in journal (Refereed)
  • 188.
    Ibrahem, Ismail
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    Afewerki, Samson
    Mid Sweden University, Faculty of Science, Technology and Media, Department of applied science and design.
    Breistein, Palle
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    Córdova, Armando
    Mid Sweden University, Faculty of Science, Technology and Media, Department of applied science and design.
    One-pot three-component catalytic asymmetric synthesis of homoallylboronates2012In: ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY. Vol 243, American Chemical Society (ACS), 2012, p. 889-INOR-Conference paper (Refereed)
    Abstract [en]

    1. A novel one-pot three-component catalytic enantioselective reaction between bis(pinacolato)diboron, enals and 2-(triphenylphosphoranylidene)acetate esters employing inexpensive bench stable Cu salts and simple chiral amine as co-catalysts is presented. The reaction proceeds via a tandem catalytic asymmetric conjugate borane addition/Wittig sequence where the b-boration step is 1,4-selective and gives the corresponding homoallylboronate products with high enantiomeric ratios (up to 97.5:2.5 er).

    2. The direct intermolecular regiospecific and highly enantioselective a-allylic alkylation of linear aldehydes by combination of achiral bench stable Pd(0) complexes and simple chiral amines as co-catalysts is disclosed. The co-catalytic asymmetric chemoselective and regiospecific a-allylic alkylation reaction is linked in tandem with in situ reduction to give the corresponding 2-alkyl alcohols with high enantiomeric ratios (up to 98:2 er). It is also an expeditious entry to valuable 2-alkyl substituted hemiacetals and 2-alkyl-butane-1,4-diols.

  • 189.
    Ibrahem, Ismail
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    Breistein, Palle
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    Córdova, Armando
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    One-Pot Three-Component Catalytic Enantioselective Synthesis of Homoallylboronates2011In: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 50, no 50, p. 12036-12041Article in journal (Refereed)
    Abstract [en]

    No longer a simple bor(ation): The title reaction between bis(pinacolato)diboron, enals, and 2-(triphenylphosphoranylidene)acetates employing bench-stable copper salts and a simple chiral amine co-catalyst is presented. The reaction proceeds through a catalytic asymmetric conjugate borane addition/Wittig sequence wherein the β-boration step is 1,4-selective and gives the corresponding homoallylboronate products with high enantiomeric ratios.

  • 190.
    Ibrahem, Ismail
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of applied science and design.
    Breistein, Palle
    Mid Sweden University, Faculty of Science, Technology and Media, Department of applied science and design.
    Córdova, Armando
    Mid Sweden University, Faculty of Science, Technology and Media, Department of applied science and design.
    One-pot three-component highly selective synthesis of homoallylboronates by using metal-free catalysis2012In: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 18, no 17, p. 5175-5179Article in journal (Refereed)
    Abstract [en]

    Metal-free selectivity: The first metal-free one-pot three-component highly chemo- and regioselective catalytic synthesis of homoallylboranes using simple N-heterocyclic carbenes (NHC) and amines is presented. The catalytic reaction between B 2(pin) 2, α,β-unsaturated aldehydes and 2-(triphenylphosphoranylidene)acetate esters proceeds through a catalytic metal-free β-boration/Wittig cascade sequence (see scheme). © 2012 WILEY-VCH Verlag GmbH &amp; Co. KGaA, Weinheim.

  • 191.
    Ibrahem, Ismail
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    Iqbal, Muhammad Naeem
    Stockholm University.
    Verho, Oscar
    Stockholm University.
    Eivazihollagh, Alireza
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    Olsén, Peter
    Stockholm University.
    Edlund, Håkan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    Tai, Cheuk-Wai
    Stockholm University.
    Norgren, Magnus
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    Johnston, Eric V.
    Sigrid Therapeutics, Universitetsvägen 8 (Villa Bellona), Stockholm.
    Copper Nanoparticles on Controlled Pore Glass and TEMPO for the Aerobic Oxidation of Alcohols2018In: ChemNanoMat, ISSN 2199-692X, Vol. 4, no 1, p. 71-75Article in journal (Refereed)
    Abstract [en]

    Herein, we report on the facile synthesis of a heterogeneous copper nanocatalyst and its combination with 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) for the aerobic oxidation of alcohols to their corresponding carbonyl compounds. This low cost copper nanocatalyst was found to exhibit excellent recyclability, making it a highly attractive catalytic system from an economical and environmental point of view. Extensive characterization of the catalyst by a number of techniques revealed that it was comprised of well-dispersed Cu(I/II) nanoparticles with an average size of around 6nm.

  • 192.
    Ibrahem, Ismail
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
    Ma, Guangning
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Afewerki, Samson
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Córdova, Armando
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Palladium/Chiral Amine Co-catalyzed Enantioselective beta-Arylation of alpha,beta-Unsaturated Aldehydes2013In: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 52, no 3, p. 878-882Article in journal (Refereed)
    Abstract [en]

    Palladium and a simple chiral amine are used as co-catalysts for the enantioselective conjugate addition of aryl boronic acids to α,β-unsaturated aldehydes (see scheme). The synthetic utility of this co-catalyzed reaction was demonstrated in the short total syntheses of (R)-(-)-curcumene and 4-aryl-2-ones. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  • 193.
    Ibrahem, Ismail
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    Santoro, Stefano
    Stockholm Univ, Dept Organ Chem, Arrhenius Lab, SE-10691 Stockholm, Sweden.
    Himo, Fahmi
    Stockholm Univ, Dept Organ Chem, Arrhenius Lab, SE-10691 Stockholm, Sweden.
    Cordova, Armando
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
    Enantioselective Conjugate Silyl Additions to alpha,beta-Unsaturated Aldehydes Catalyzed by Combination of Transition Metal and Chiral Amine Catalysts2011In: Advanced Synthesis and Catalysis, ISSN 1615-4150, E-ISSN 1615-4169, Vol. 353, no 2-3, p. 245-252Article in journal (Refereed)
    Abstract [en]

    We report that transition metal-catalyzed nucleophilic activation can be combined with chiral amine-catalyzed iminium activation as exemplified by the unprecedented enantioselective conjugate addition of a dimethylsilanyl group to alpha,beta-unsaturated aldehydes. These reactions proceed with excellent 1,4-selectivity to afford the corresponding beta-silyl aldehyde products 3 in high yields and up to 97:3 er using inexpensive bench stable copper salts and simple chiral amine catalysts. The reaction can also generate a quaternary stereocenter with good enantioselectivity. Density functional calculations are performed to elucidate the reaction mechanism and the origin of enantioselectivity.

  • 194. Ilvesniemi, H.
    et al.
    Giesler, R.
    van Hees, Patrick
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Magnussson, T.
    Melkerud, P. A.
    General description of the sampling techniques and the sites investigated in the Fennoscandinavian podzolization project2000In: Geoderma, ISSN 0016-7061, E-ISSN 1872-6259, Vol. 94, no 2-4, p. 109-123Article in journal (Refereed)
    Abstract [en]

    A 3-year project focusing on the fundamental processes of podzolization was carried out on three sampling sites in northern Fennoscandinavia. The soils were selected based on the previous information of the soil properties to represent typical soils in the area. In this article, the post-glacial history of the sites, site vegetation and general properties of the soils, as well as the methods used are presented. Two of the sites were classified as Typic HapLocryods and one as an Entic Haplocryod. The post-glacial age of the sites was between 9000 and 9500 years BP and the parent material was glacial till in one of the sites and glaciofluvial material in two of them. (C) 2000 Elsevier Science B.V. All rights reserved.

  • 195.
    Imam, Mewlude
    et al.
    Linköping university; European Spallation Source ERIC, Lund.
    Höglund, Carin
    Linköping university; European Spallation Source ERIC, Lund.
    Schmidt, Susann
    Linköping university; European Spallation Source ERIC, Lund; IHI Ionbond AG, Olten, Switzerland.
    Hall-Wilton, Richard
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design. European Spallation Source ERIC, Lund.
    Birch, Jens
    Linköping University.
    Pedersen, Henrik
    Linköping University.
    Plasma CVD of hydrogenated boron-carbon thin films from triethylboron2018In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 148, no 3, article id 034701Article in journal (Refereed)
    Abstract [en]

    Low-temperature chemical vapor deposition (CVD) of B - C thin films is of importance for neutron voltaics and semiconductor technology. The highly reactive trialkylboranes, with alkyl groups of 1-4 carbon atoms, are a class of precursors that have been less explored for low-temperature CVD of B - C films. Herein, we demonstrate plasma CVD of B - C thin films using triethylboron (TEB) as a single source precursor in an Ar plasma. We show that the film density and B/C ratio increases with increasing plasma power, reaching a density of 2.20 g/cm3 and B/C = 1.7. This is attributed to a more intense energetic bombardment during deposition and more complete dissociation of the TEB molecule in the plasma at higher plasma power. The hydrogen content in the films ranges between 14 and 20 at. %. Optical emission spectroscopy of the plasma shows that BH, CH, C2, and H are the optically active plasma species from TEB. We suggest a plasma chemical model based on β-hydrogen elimination of C2H4 to form BH3, in which BH3 and C2H4 are then dehydrogenated to form BH and C2H2. Furthermore, C2H2 decomposes in the plasma to produce C2 and CH, which together with BH and possibly BH3-x(C2H5)x are the film forming species. 

  • 196. Isaac, Giorgis
    et al.
    Bylund, Dan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Månsson, Jan Eric
    Markides, Karin E
    Bergquist, Jonas
    Analysis of phosphatidylcholine and sphingomyelin molecular species from brain extracts using capillary liquid chromatography electrospray ionization mass spectrometry2003In: Journal of Neuroscience Methods, ISSN 0165-0270, Vol. 128, no 1/2, p. 111-119Article in journal (Refereed)
    Abstract [en]

    One feature of complex lipids is that many subtypes of these molecules exist as a diverse mixture in a biological sample. Qualitative and quantitative analysis of these closely related molecules require sensitive and specific analytical methods to detect intact phospholipids (PL) and sphingomyelin (SM) species and to differentiate between them. Conventional analytical methods require laborious procedures including separation by column, argentation thin-layer chromatography or liquid chromatography (LC) after pre- or post-column derivatization. In the present work, a method based on reversed phase capillary LC coupled on-line to electrospray ionization mass spectrometry (LC/ESI/MS) has been developed to gather tools for lipidomic studies, i.e. the profiling of complex mixtures of lipids in small amounts of various cells and tissues. The LC/MS system used consisted of an LC pump in an isocratic elution, a reversed phase capillary column and a single quadrupole mass spectrometer operated in the positive ion mode. A successful separation of phosphatidylcholine (PC) and SM molecular species was obtained with a minimum detectable quantity (MDQ) in the low fmol range injected on column. The method was applied to human brain extracts. Furthermore, the extraction efficiencies of the traditional Folch method and pressurized fluid extraction (PFE) were compared using the human brain. It was found that the intensity of the PC and SM molecular species extracted by PFE is two times that of Folch.

  • 197.
    Isaksson, Dan
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Högberg, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Sjödin, Kristina
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Enantioselektiv syntes av norterpenen Cryptone: 19:e Organikerdagarna, 14-17 juni, Linköping2004Conference paper (Other scientific)
  • 198.
    Isaksson, Dan
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Högberg, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Sjödin, Kristina
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Enantioselektiv syntes av seskviterpenen torreyol och andra kadinenderivat: 20:e Organikerdagarna, 12-15 juni 2006, Kalmar, Poster2006Conference paper (Other scientific)
  • 199.
    Isaksson, Dan
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Lindmark Henriksson, Marica
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Sjödin, Kristina
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Högberg, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Hemiacetal ester formation in lipase catalysed transesterifications of vinyl esters with hindered secondary alcohols: Meeting abstract2003In: ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 2003Conference paper (Refereed)
  • 200.
    Isaksson, Dan
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Lindmark-Henriksson, Marica
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Sjödin, Kristina
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Högberg, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Hemiacetals and their esters as side-products in lipase catalysed transesterification of vinyl esters with sterically hindered alcohols2004In: Journal of Molecular Catalysis B: Enzymatic, ISSN 1381-1177, E-ISSN 1873-3158, Vol. 31, no 1-3, p. 31-37Article in journal (Refereed)
    Abstract [en]

    Hemiacetals and their esters are formed as side-products in lipase catalysed transesterification of vinyl esters with sterically hindered secondary alcohols. Scope and limitations of the reaction as well as the consequences of it for lipase catalysed kinetic resolutions are discussed.

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