Method for producing biphenyltetracarboxylic esters

Details Method for producing biphenyltetracarboxylic esters Method for producing biphenyltetracarboxylic esters

1984-08-29

1986-04-08

Trousof, Natalie

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

Organic compounds

Carboxylic acid esters

560 76, C07C 67343

Patent

active

045814694

ABSTRACT:
A biphenyltetracarboxylic ester, particularly, 3,3',4,4'-biphenyltetracarboxylic tetraester, is prepared in an increased yield by first oxidative coupling, at 140.degree. C. to 260.degree. C., an o-phthalic diester with a molecular oxygen-containing gas, for example, air, in the presence of a catalyst comprising predetermined amounts of a Pd salt, a basic bidentate ligand compound, and a Cu salt to convert a portion of the o-phthalic diester to the corresponding biphenyltetracarboxylic ester and by additionally oxidative coupling in one or more steps, in each step, the remaining portion of o-phthalic diester with a molecular oxygen-containing gas at 140.degree. C. to 260.degree. C. while controlling the composition of the catalyst to an extent such that the entire molar amount of the Pd salt is 0.0001 to 0.01 time that of the o-phthalic diester, the entire molar amount of the ligand compound is 0.5 to 4 times that of the Pd salt and the entire molar amount of the Cu salt is 0.01 to 5 times that of the Pd salt.

REFERENCES:
patent: 3857874 (1974-12-01), Ichikawa et al.
patent: 3983159 (1976-09-01), Ichikawa et al.
patent: 4292435 (1981-09-01), Itatani et al.
patent: 4338456 (1982-07-01), Itatani et al.

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