2,3,3',4'-Biphenyltetracarboxylic acid dianhydride

Details 2,3,3',4'-Biphenyltetracarboxylic acid dianhydride 2,3,3',4'-Biphenyltetracarboxylic acid dianhydride

1975-07-21

1977-09-13

Jiles, Henry R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D30789

Patent

active

040481972

ABSTRACT:
A process for separating and purifying biphenyltetracarboxylic dianhydride isomers from a mixture of these isomers by fractional crystallization in aliphatic acid anhydrides or acetone. The isomeric mixture is obtained by heating biphenyltetracarboxylic acids, optionally in the presence of an aliphatic acid anhydride. The biphenyltetracarboxylic acids are obtained by oxidizing coupling dimers of o-xylene or by hydrolyzing coupling dimers of dimethyl phthalate. 2,3,3',4'-biphenyltetracarboxylic acid dianhydride which can be isolated from the above mixture can be used to form polyimide.

REFERENCES:
Kenner et al., J. Chem. Soc., V. 105, pp. 2471-2482 (1914).
Itatani et al., Chem. and Industry, June 12, 1971, pp. 674-675.
Cram et al., Organic Chem.-McGraw Hill, p. 305 (1959).

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