Process for the preparation of gamma-nonalactones in native form

摘要

Prepn. of (un)satd. gamma lactones having 9 C atoms, or their mixts. comprises (Ai) culturing microorganisms chosen from Pichia ohmeri and Pichia stipitis, or both, in substrate comprising 18C unsatd. hydroxy-acid with OH gp. on 13th C atom. or glyceride contg. the acid to form mixt. contg. gamma-nonanolide of formula (I); or (Aii) subjecting substrate contg. linoleic acid, linolenic acid or their mixt. to lipoxidation; and then (B) steam distilling the prodn. to obtain gamma-2-nonenolide of formula (II), 2, 6-nonadienolide of formula (III) or their mixt..