Method of producing biphenyltetracarboxylic esters

Details Method of producing biphenyltetracarboxylic esters Method of producing biphenyltetracarboxylic esters

1981-02-18

1982-07-06

Trousof, Natalie

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

Organic compounds

Carboxylic acid esters

560 76, C07C 67343

Patent

active

043384560

ABSTRACT:
A biphenyltetracarboxylic tetraester, especially, 3,3',4,4'-biphenyltetracarboxylic tetraalkyl ester, is produced by bringing an orthophthalic diester, especially, orthophthalic dialkylester, into contact with a molecular oxygen-containing gas in the presence of a catalyst consisting of a mixture of a palladium salt with 2,2'-bipyridyl or a chelating reaction product of a palladium salt with 2,2'-bipyridyl, so as to promote oxidative coupling of the orthophthalic diester.

REFERENCES:
patent: 3784350 (1973-07-01), Josephson et al.
patent: 3857874 (1974-12-01), Ichikawa et al.
patent: 4008266 (1977-02-01), Intille

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