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The products of reduction of 2-methylcyclohexanone by Aspergillus repens MA0197 were analyzed quantitatively by GC after conversion to corresponding diastereoisomeric ( -)-menthyl carbonate derivatives. Although the contents varied considerably with time, the predominant production of S-alcohol was observed, that is, Prelog's rule was obeyed.
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Onishi et al. (1996) studied this question.
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