Process for preparation of 3,3',4,4'-biphenyltetracarboxylic aci

Details Process for preparation of 3,3',4,4'-biphenyltetracarboxylic aci Process for preparation of 3,3',4,4'-biphenyltetracarboxylic aci

1986-01-21

1988-02-23

Lone, Werren B.

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

Organic compounds

Carboxylic acids and salts thereof

502172, 502185, 502223, 502306, 502313, 502326, 502327, 502328, 560 96, 562488, C07C 51347

Patent

active

047271850

ABSTRACT:
When a 4-halogenoorthophthalic acid salt is dissolved together with a base in an alkaline aqueous solution and the solution is heated in the presence of a catalyst comprising a noble metal supported on a carrier, a formic acid salt and a small amount of an aliphatic compound containing a hydroxyl group, a 3,3',4,4'-biphenyltetracarboxylic acid salt is obtained in a high yield.

REFERENCES:
patent: 2823230 (1958-02-01), Raecke
patent: 2906774 (1959-09-01), Raecke et al.
patent: 3751456 (1973-08-01), Wu

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