KRYSTALLINSK FENYLACETAT-ENANTIOMER-PAR OG FREMGANGSMAATE FOR FREMSTILLING AV ET PESTICID ENANTIOMER-PAR

摘要

A pesticidal phenylacetate Y enantiomer pair is prepared by precipitating crystals of novel phenylacetate X enantiomer pair in the presence of crystals of phenylacetate X from a solution of racemic phenylacetate and recovering the filtrate rich in the Y enantiomer pair. The phenylacetate X crystals can be redissolved, epimerized and the epimerizaion product recycled to improve the yield of phenylacetate Y enantiomer pair.