Process for manufacturing crystal violet lactone

摘要

Crystal Violet Lactone (CVL) is produced in high yield and highly pure form by a process comprising condensing Michlers hydrol with 3- dimethylaminobenzoic acid to form leuco CVL, extracting the reaction mixture containing the leuco CVL with an aromatic hydrocarbon solvent, such as toluene, or a mixture of such a solvent and a water-immiscible alkane, such as heptane, to remove impurities therefrom and treating the extracted reaction mixture with an inorganic oxidizing agent to convert the leuco CVL to CVL.