HYDROXYMETHYLBUTENOIC ACIDS,PROCESS FOR THE PREPARATION THEREOF,AND PHARMACEUTICAL AND VETERINARY COMPOSITIONS COMPRISING THEM

摘要

A useful industrial chemical, oxazolinoazetidinylhydroxymethylbutenoic acid derivative (II) can be produced by oxidizing the corresponding oxazolinoazetidinylhalomethylbutenoic acid derivative(I). wherein R is an alkyl, aralkyl or aryl group, R<1> is a hydrogen atom or a carboxy protecting group and Hal is a halogen atom.