Process for the preparation of indigo compounds

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

1991-11-21

1993-02-16

Springer, David B.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548459, C07D40304

Patent

active

051872838

ABSTRACT:
An indigo compound is prepared from a corresponding indole compound which is unsubstituted at the 2- and 3- positions. The indole compound and an organic hydroperoxide are reacted in the presence of a catalyst which is a metal selected from the group consisting of the metals of Groups 4, 5 and 6 of the periodic table or a compound of the metal. The reaction is conducted while taking out water from a reaction system, said water being that introduced in the reaction system or formed during the reaction, or while controlling the amount of water, which is introduced in the reaction system, at a level not greater than 1 mole per mole of the indole compound.

REFERENCES:
patent: 4992556 (1991-02-01), Takaki et al.
CA 114:124552y (Apr. 8, 1991).

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