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

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

1990-09-21

1992-01-14

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

560 96, 562480, C07C 51353, C07C 51377

Patent

active

050812912

ABSTRACT:
A process for the preparation of 3,3',4,4'-biphenyltetracarboxylic acid salt by the dehalodimerization of a 4-halophthalic acid salt. The process uses hydroxylamine or one of its salts as the reducing agent in an alkaline solution, preferably of pH 10 or above, and palladium catalyst. The reaction is carried out between 50.degree. and 150.degree. C.

REFERENCES:
patent: 4292435 (1981-09-01), Itatani et al.
patent: 4338456 (1982-06-01), Itatani et al.
patent: 4720576 (1988-01-01), Wada et al.
patent: 4727185 (1988-02-01), Shoji et al.

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