The stereochemistry of the Candida antarctica lipase B (CALB) catalyzed res
olution of diacetate 1 or diol 4 was analyzed. The primary and secondary ac
etate hydrolyses were studied separately using monoacetates 2 and 3. The en
antioselectivity of CALB was found to be lower towards primary rather than
secondary acetates/alcohols. The steric course of the process is discussed.
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