PROCESS FOR THE MANUFACTURE OF CRYSTAL VIOLET LACTONE

摘要

1359899 Crystal violet lactone IMPERIAL CHEMICAL INDUSTRIES Ltd 9 Feb 1973 [2 Feb 1972] 4827/72 Heading C2C Crystal violet lactone, i.e. 3,3-bis-(4-dimethylaminophenyl) - 6 - dimethylaminophthalide is prepared by condensing Michler's Hydrol with m - dimethylaminobenzoic acid in an acid medium and oxidizing the resulting leuco compound, i.e. 2-[4,4SP1/SP-bis-(dimethylamino) benzhydryl] - 5 - dimethylaminobenzoic acid, without isolation, by means of a persulphate. The oxidation is preferably performed in an aqueous alkaline medium. Suitable persulphates include ammonium, sodium, potassium and methylammonium persulphate.