Process for manufacturing crystal violet lactone

Details Process for manufacturing crystal violet lactone Process for manufacturing crystal violet lactone

C - Chemistry, Metallurgy

07

D

260/366.3

C07D 307/88 (2006.01) C07D 307/885 (2006.01)

Patent

CA 1087202

ABSTRACT OF THE DISCLOSURE 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 tolu- ene, 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 oxi- dizing agent to convert the leuco CVL to CVL.

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