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Cyanohydrins 2 are obtained with high enantioselectivity from aromatic aldehydes and HCN in the presence of (S)-oxynitrilase (E.C.4.1.2.11). Acid-catalyzed hydrolysis of the cyanohydrins 2 affords the corresponding (S)-a-hydroxy carboxylic acids 3 without racemization. (R)-Cyanohydrins with high optical purity are obtained from the addition of HCN to aldehydes, catalyzed by (R)-oxynitrilase (E.C.4.1.2.10) when an appropriate organic solvent is used (e.g. ethyl acetate)2. If the reaction is

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