A pesticidal phenylacetate rich in the Y enantiomer pair is prepared by precipitating the novel intermediate crystalline 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 are redissolved, epimerized and the resulting racemate recycled to improve the yield of phenylacetate Y enantiomer pair.
从外消旋
苯乙酸盐溶液中析出新型中间体结晶
苯乙酸盐 X 对映体,在
苯乙酸盐 X 晶体存在的情况下制备富含 Y 对映体的
杀虫剂苯乙酸盐,并回收富含 Y 对映体的滤液。将
苯乙酸 X 晶体重新溶解,进行外消旋化,并回收所产生的外消旋体,以提高
苯乙酸 Y 对映体的产率。