VERFAHREN ZUR HERSTELLUNG VON 2,5-DI-PHENYLAMINO-TEREPHTALSAURE UND IHRER DIALKYLESTER IN HOHER REINHEIT

摘要

2096845 9209558 PCTABS00013 Disclosed is an environmentally and economically improved method for the preparation of 2,5-di(phenylamino)terephthalic acid and its dialkyl esters of general formula (I), in which R is a hydrogen atom or a methyl group and R' is a hydrogen atom or a methyl or ethyl group.