METHOD FOR ISOLATION OF 2,5-BIPHENYL DICARBOXYLIC ACID

摘要

FIELD: organic chemistry. SUBSTANCE: method is carried out by isolation of 2,5-diphenyl dicarboxylic acid against products of oxidation of 2,5-dimethyl biphenyl. Method involves treatment of products of oxidation of 2,5-dimethyl biphenyl with aqueous solution of alkaline metal salt. Then thus prepared mixture is filtered, filtrate being acidified to pH 4.35-4.40. Thus obtained mixture is filtered, filtrate is acidified to pH less than 3. By filtration thus prepared mixture desired product is isolated as precipitate. EFFECT: improved quality of desired product.