Process for the preparation of indigo compounds

Details Process for the preparation of indigo compounds Process for the preparation of indigo compounds

1989-04-25

1990-11-27

Springer, David B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C09B 700

Patent

active

049737066

ABSTRACT:
Disclosed is a process for preparing an indigo compound in improved yield by reacting indole or other indole compound having no substituent at the 2- and 3-positions with an organic hydroperoxide in the presence of an additive selected from the group consisting of (1) a carboxyl compound and (2) a boric acid ester compound. The yield of the indigo compound can further be increased by using 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.

REFERENCES:
patent: 4151170 (1979-04-01), Gosteli
Beilsteins Handbuch der Organischen Chemie, Sachregister fur die Bande 23-25.
Rodd's Chemistry of Carbon Compounds, vol. IV, Part B, Elsevier Scientific Publishing Company, 1977, pp. 350-357.

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