Process for the preparation of 2,5-diarylaminoterephthalic acids

Details Process for the preparation of 2,5-diarylaminoterephthalic acids Process for the preparation of 2,5-diarylaminoterephthalic acids

1989-09-29

1991-01-01

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

560 44, 562457, C07C 5121

Patent

active

049819976

ABSTRACT:
A process for the preparation of 2,5-diarylaminoterephthalic acids by oxidation of 2,5-diarylamino-3,6-dihydroterephthalic acid esters using oxygen or oxygen-containing gases, preferably air, in alcoholic-alkaline or alcoholic-aqueous-alkaline solution or suspension in the presence of an oxygen-transferring agent and working up to give the 2,5-diarylaminoterephthalic acids, characterized in that the oxidation is carried out in the presence of quaternary ammonium compound.

REFERENCES:
patent: 3388149 (1968-06-01), Dien

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