Process for the preparation of 2,5-di(phenylamino)-terephthalic acid and its dialkyl esters in high purity

US5208365A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Hermann Fuchs
• Walter Gilb · Hofheim, DE
• Otto Arndt · Hofheim, DE

Key dates

• Filing date: Jun 11, 1992
• Grant date: May 4, 1993
• Expiry date: Jun 11, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C227/08
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of 2,5-di(phenylamino)terephthalic acid and its dialkyl esters of formula (I): ##STR1## in which R is a hydrogen atom or a methyl group and R' is a hydrogen atom or a methyl or ethyl group.