was performed by enantiomerically selective transesterification with vinyl acetate catalysed
by commercial and our own-prepared fungal lipases to yield diacetates (R, R)-3a–d and
monoacetates (S, S)-2a–d in high enantiomeric purity. The monoacetates (R, R)-2a–d were
also prepared from the racemic diacetates rac-3a–d by lipase-catalysed hydrolysis.