Fluorine-containing β-diketones (la-d) were reduced by free bakers' yeast (FBY) and immobilized baker yeast (IMBY) in water, to give optically-active fluorinated β-hydroxyketones (2a-d). It was found that the reaction is highly regioselective, and that the stereochemistry of the reduction is controlled by the R substituent.
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Bucciarelli et al. (1994) studied this question.
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