Process for preparing thio-indigo dyestuffs

Details Process for preparing thio-indigo dyestuffs Process for preparing thio-indigo dyestuffs

C - Chemistry, Metallurgy

09

B

8/3, 8/30, 260/3

C09B 7/00 (2006.01) C09B 7/10 (2006.01) D06P 1/00 (2006.01)

Patent

CA 1079740

Abstract of the Disclosure: Thioindigo and its derivatives are obtained in high yield and excellent purity by oxidizing corresponding 3-hydroxy- thionaphthenes with peroxo-disulfate in an aqueous alkaline solution.

245096

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