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Abstract

This invention relates to methods for producing optically active hydroxyesters and also to methods for producing and purifying optically active five-membered ring lactones. More specifically, the invention provides methods for efficiently, safely, and selectively producing and purifying optically active (R)-hydroxyester (shown by formula 1) and optically active (S)-hydroxyester (shown by formula 2) in high state of purity at ordinary temperature. The invention also relates to application of the interconvertible optically active (R)-five-membered ring lacton (shown by formula 5). They are intermediates for synthesizing various medicines, agricultural chemicals, and biologically active substances, however especially useful for synthesizing pheromone of a noxious insect, Popillia japonica Newman. ##STR1## (Here, R.sub.1 denotes --C.tbd.C--R.sub.3 or --C.dbd.C--R.sub.3 ; R.sub.2 and R.sub.3 denote straight chain or branched alkyl groups containing 1 to 10 carbon atoms; R.sub.4 denotes alkyl groups, aralkyl groups, or haloalkyl groups containing 1 to 12 carbon atoms and the end group of R.sub.4 may be carboxyl groups; * denotes asymmetricrbon atoms.)

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First Claim