Process for the preparation of...

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C - Chemistry, Metallurgy

07

C

260/509.3, 260/4

C07C 63/331 (2006.01) C07C 67/343 (2006.01) C07C 69/76 (2006.01) C07D 307/89 (2006.01)

Patent

CA 2000426

CASE 6187 ASC/kmf ABSTRACT OF THE INVENTION THE PROCESS FOR THE PREPARATION OF 3,3',4,4'-BIPHENYLTETRACARBOXYLIC ACID AND ITS DERIVATIVES Biphenyl tetracarboxylic 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.

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