Process for producing biphenyltetracarboxylic dianhydride

Details Process for producing biphenyltetracarboxylic dianhydride Process for producing biphenyltetracarboxylic dianhydride

1993-02-16

1993-11-02

Dentz, Bernard

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30789

Patent

active

052585301

ABSTRACT:
A process for producing a biphenyltetracarboxylic dianhydride which comprises the step of: heating phthalic anhydride at a temperature of from 135.degree. to 300.degree. C. in the presence of a palladium catalyst thereby to allow the phthalic anhydride to undergo a dimerization reaction. According to the process, biphenyltetracarboxylic dianhydride can be synthesized by the direct dimerization of phthalic anhydride.

REFERENCES:
patent: 3145237 (1964-08-01), Van Helden et al.
patent: 3940426 (1976-02-01), Itatani et al.
Chemical Abstracts, vol. 80, No. 5, Feb. 4, 1974, abstract No. 26963t.

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