Process for the preparation of 2,5-di-phenylamino-terephthalic a

Details Process for the preparation of 2,5-di-phenylamino-terephthalic a Process for the preparation of 2,5-di-phenylamino-terephthalic a

1995-03-02

1997-04-01

Cintins, Marianne M.

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

Organic compounds

Carboxylic acid esters

562457, 546 49, C07C10138, C07C10168, C07C10376

Patent

active

056167792

ABSTRACT:
The present invention relates to a process for the preparation of 2,5-di-phenylamino-terephthalic acid and its dialkyl esters of the formula ##STR1## in which R is a hydrogen atom or a methyl or an ethyl group, by reaction of a succinic acid dialkyl ester with a sodium alcoholate in xylene, treatment of the resulting 2,5-dihydroxy-cyclohexadiene-1,4-di-carboxylic acid dialkyl ester with acid and aniline, dehydrogenation of the resulting 2,5-di-phenylamino-dihydro-(3,6)-terephthalic acid dialkyl ester by means of oxygen, if appropriate hydrolysis of the 2,5-di-phenylamino-terephthalic acid dialkyl ester formed and liberation of the 2,5-di-phenylamino-terephthalic acid from the di-sodium salt formed. The 2,5-di-phenylamino-dihydro-(3,6)-terephthalic acid dialkyl ester is reacted with pure oxygen in the presence of an alkali metal ion and/or an alkaline earth metal ion. This significantly decreases undesirable impurities.

REFERENCES:
patent: 3342823 (1967-09-01), Dien
patent: 3555087 (1971-01-01), Grosso et al.
patent: 3671451 (1972-06-01), Butterfield
patent: 4435589 (1984-03-01), Rolf et al.
patent: 4981997 (1991-01-01), Schmirtz et al.
patent: 5208365 (1993-05-01), Ohno et al.
Chemical Abstracts, vol. 102, Abstract No. 5780p, "Rhodium (II) acetate catalyzed hydrocarbon oxidations by molecular oxygen", p. 525, 1990.

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