SYNTHESIS OF DIALKYL SUCCINYLSUCCINATE ESTER AND ITS CONVERSION TO DIALKYL 2,5-DIARYLAMINO-3,6-DIHYDROTEREPHTHALATE ESTER

摘要

PURPOSE: To process for producing mixed di-1C-6C alkyl succinylsuccinate esters having a high solubility in an org. solvent. ;CONSTITUTION: (1) Dimethyl succinate is subjected to transesterification with 2C-6C-alkalnol in the presence of a transesterification catalyst; (2) 2 mol. mixed dialkyl succinylsuccinate ester formed in the stage (1) is condensed in the presence of a sodium 1C-6C-alkylate and alcohol at a temp. of 100 to 160°C to form the mixed di-1C-6C alkyl succinylsuccinate esters or their disodium salt and (3) the condensation product thereof is recovered.;COPYRIGHT: (C)1993,JPO