@article{SyldatkAndreeStoffregenetal.1987,
  author    = {Syldatk, C. and Andree, H. and Stoffregen, A. and Wagner, F. and Stumpf, B. and Ernst, L. and Zilch, H. and Tacke, Reinhold},
  title     = {Enantioselective reduction of acetyldimethylphenylsilane by Trigonopsis variabilis (DSM 70714)},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-63836},
  year      = {1987},
  abstract  = {Growing and resting cells of the yeast Trigonapsis variabilis (DSM 70714) can be used for the enantioselective reduction of the organosilicon compound acetyldimethylphenylsilane (J) to give optically active (R)-(1-hydroxyethyl)dimethylphenylsilane [(R)-2] in good yields. The enantiomeric purity of the isolated product was determined tobe 62-86\% ee depending on the substrate concentration used. Both substrate and product caused an inhibition of the reaction at concentrations higher than 0.35 and 0.5 g/1, respectively. Besides, higher substrate and product concentrations led to increased formation of the by-product 1,1,3,3-tetramethyl-1,3-diphenyldisiloxane. Considering the limiting substrate and product concentrations, it was possible to use the same biomass at least 5 times without significant loss of enzyme activity. 3-Methyl-3-phenyl-2-butanone (5) and acetyldimethylphenylgermane (7), which represent carbon and germanium analogues of 1, were also found to be accepted as substrates by Trigonapsis variabilis (DSM 70714). The reduction rates of the silicon {1) and germanium compound {7) were much higher than the transformation rate of the corresponding carbon analogue 5.},
  subject      = {Anorganische Chemie},
  language  = {en}
}
@article{TackeHengelsbergZilchetal.1989,
  author    = {Tacke, Reinhold and Hengelsberg, H. and Zilch, H. and Stumpf, B.},
  title     = {Enantioselective microbial reduction of 1,1-dimethyl-1-sila-cyclohexan-2-one with growing cells of the yeast Kloeckera corticis (ATCC 20109)},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-64010},
  year      = {1989},
  abstract  = {(R)-1,1-Dimethyl-1-sila-cyclohexan-2-ol [(R)-2] was prepared by enantioselective microbial reduction of 1,1-dimethyl-1-sila-cyclohexan-2-one (1) with growing cells of the yeast Kloeckera corticis (ATCC 20109). At a substrate concentration of 0.5 g/1 (temperature 27° C, incubation time 16 h), (R}-2 was obtained on a preparative scale in 60\% yield and with an enantiomeric purity of 92\% ee. Repeated recrystallization of the biotransformation product from n-hexane raised the enantiomeric purity to 99\% ee.},
  subject      = {Anorganische Chemie},
  language  = {en}
}