Process for the production of 2,5-dianilino-terephthalic acids

Details Process for the production of 2,5-dianilino-terephthalic acids Process for the production of 2,5-dianilino-terephthalic acids

1995-08-25

1997-08-19

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 5109

Patent

active

056590768

ABSTRACT:
A process for the transesterification of dimethyl succinylsuccinate with one or more aliphatic alcohols which in each case have at least 2 C atoms, in the presence of an acidic catalyst and in the presence or absence of a diluent which is inert under the reaction conditions, with exclusion of oxygen and under pressure, at least one of the two methoxy groups being replaced by the oxy group corresponding to the alcohol used and use of the process in a process for the preparation of terephthalic acids and of quinacridones.

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patent: 4956464 (1990-09-01), Bender et al.
patent: 4981997 (1991-01-01), Schutze et al.
Liebermann, Esters of Succinylsuccinates and Their Reactions with Ammonia and Primary Amines, Annalen d. Chemie 404, 272-321 (1911).

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