Process for the preparation of indigo compound

C - Chemistry – Metallurgy – 09 – B

Patent

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260/306.1

C09B 7/02 (2006.01) C09B 7/00 (2006.01)

Patent

CA 1334096

Disclosed is a process for the preparation of an indigo compound by reacting an indole compound having no substituent at the 2- and 3-positions with an organic hydroperoxide. A metallic compound catalyst capable of oxidizing carbon atom at the 3-position of the indole compound, such as a compound of a metal of group 4A, 5A or 6A of the periodic table, may be present in the reac- tion system.

591739

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