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

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

1989-10-06

1992-01-14

Dees, Jose G.

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

Organic compounds

Carboxylic acid esters

560 76, 562488, C07C 67343

Patent

active

050812815

ABSTRACT:
Biphenyl tetracarboxlic acid esters and derivatives thereof are prepared by the coupling reaction of 4-halogen substituted o-benzenedicarboxylic acid ester, carried out in an aprotic polar solvent in the presence of a pre-prepared triphenylphosphine-nickel chloride or trialkylphosphine-nickel chloride catalyst, zinc powder as the reducing agent, and an alkali metal halide promoting agent. The ester may be hydrolyzed in basic solution to afford the corresponding acid. The acid may be heated or boiled with acetic anhydride to afford the biphenyl dianhydride.

REFERENCES:
patent: 4263466 (1981-04-01), Colon et al.
patent: 4294976 (1981-10-01), Itatani et al.
patent: 4338456 (1982-07-01), Itatani et al.
patent: 4581469 (1986-04-01), Itatani et al.
Colon et al., Journal of Organic Chemistry, vol. 51, #14, (1986), pp. 2627-2637.
Takagi et al., Bull. Chem. Soc. Japan, 57 pp. 1887, 1890, (1984).

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