Patent ID: 6291688
Filing Date: 2001-09-18
Classification: C07C,C07D

Abstract:
A method for making 2-(.omega.-alkoxycarbonylalkanoyl)-4-butanolide represented by the general formula (2) and an alkaline metal salt of the 2-(.omega.-alkoxycarbonylalkanoyl)-4-butanolide represented by the general formula (3) comprising condensation reaction of .gamma.-butyrolactone with a dicarboxylate ester represented by the general formula (1):ROOC(CH.sub.2)nCOOR (1)wherein n is an integer of 7 to 13 and R is an alkyl group; ##STR33##wherein n is an integer of 7 to 13 and R is an alkyl group; ##STR34##wherein n is an integer of 7 to 13, R is an alkyl group, and M is an alkaline metal, wherein the dicarboxylate ester represented by the general formula (1) is heated and stirred, and .gamma.-butyrolactone and an alkaline metal alcoholate are added to perform the condensation reaction.