Method of producing biphenyltetracarboxylic esters

Details Method of producing biphenyltetracarboxylic esters Method of producing biphenyltetracarboxylic esters

1980-05-21

1981-09-29

Trousof, Natalie

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

Organic compounds

Carboxylic acid esters

546 8, 546 10, C07C 67343

Patent

active

042924359

ABSTRACT:
A biphenyltetracarboxylic tetraester, especially, 3,3',4,4'-biphenyltetracarboxylic tetraalkyl ester, is produced by oxidative coupling an orthophthalic diester, especially, orthophthalic dialkylester, in a molecular oxygen-containing atmosphere in the presence of a catalyst consisting of a mixture of a palladium salt with 1,10-phenanthroline and/or 2,2'-bipyridyl or a chelating reaction product of a palladium salt with 1,10-phenanthroline or 2,2'-bipyridyl.

REFERENCES:
patent: 2578910 (1951-12-01), Uraneck
patent: 3654279 (1972-04-01), Hurley et al.
patent: 3691095 (1972-09-01), Kroll et al.
patent: 3983159 (1976-09-01), Ichikawa
patent: 4008266 (1977-02-01), Intille
Itatani et al., J. Org. Chem., 38 (1), pp. 76-79 (1973).

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