Process for the preparation of indigo compounds

C - Chemistry – Metallurgy – 09 – B

Patent

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260/306.1

C09B 7/02 (2006.01)

Patent

CA 2000990

A process is provided herein for the preparation of an indigo compound. The process includes reacting a corresponding indole compound having no substituent at the 2- and 3-positions with a percarboxylic acid in the presence of an alcohol solvent, or by reacting with heating over 60°C in the presence of an aprotic solvent.

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