PRODUCTION OF 3,3',4,4'-BIPHENYLTETRACARBOXYLIC ACID

PURPOSE:To obtain the titled compound useful as a raw material for various polymers in high yield, by dimerizing a 4-halogenoorthophthalic ester through dehalogenation in a basic aqueous solution in the presence of a noble metal carrying catalyst and a formate under heating. CONSTITUTION:A 4-halogen...

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Hauptverfasser:	KATAOKA FUMIO, SHOJI FUSAJI
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain the titled compound useful as a raw material for various polymers in high yield, by dimerizing a 4-halogenoorthophthalic ester through dehalogenation in a basic aqueous solution in the presence of a noble metal carrying catalyst and a formate under heating. CONSTITUTION:A 4-halogenoorthophthalic ester (especially preferably 4- bromoorthophthalic acid monoalkyl ester or dialkyl ester) is blended with >=2mol, preferably 2.1-5.0mol aqueous solution of a base such as potassium hydroxide, sodium hydroxide, etc., in the presence of a noble metal carrying catalyst (especially preferably Pd-carbonaceous carbon catalyst) and a formate (e.g. sodium formate, etc.) and the mixture is reacted at about 90-120 deg.C to give 3,3',4,4'-biphenyltetracarboxylic acid. The acid is readily recovered.