| 摘要 |
PURPOSE:To obtain the titled compound useful as an intermediate of an optically active phenoxypropionic acid pesticide, etc., in high yield and purity, by decomposing an optically active 2-chlorosulfinoxypropionic acid ester with a specific catalyst. CONSTITUTION:The objective compound of formula II can be prepared by decomposing the optically active 2-chlorosulfinoxypropionic acid ester of formula I (R is 1-4C alkyl) at 60-100 deg.C using a decomposition catalyst consisting of a polar aprotic compound such as phosphoric acid hexamethyltriamide, dimethylformamide, tetramethylurea, etc. The amount of the catalyst is about 5X10<-3>mol per 1mol of the compound of formula I. The starting compound of formula I can be synthesized by reacting D- or L-lactic acid ester with thionyl chloride. |
