Purification of indigo

Details Purification of indigo Purification of indigo

1993-06-14

1995-06-13

Springer, David B.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D40304

Patent

active

054244536

ABSTRACT:
This invention relates to a process for the purification of indigo, wherein the indigo is heated in an inert organic solvent at from 150.degree. to 250.degree. C. and preferably from 180.degree. to 220.degree. C.

REFERENCES:
patent: 4973706 (1990-11-01), Yamamoto et al.
patent: 4992556 (1991-02-01), Takaki et al.
patent: 5075458 (1991-12-01), Kohlhaupt et al.
patent: 5109137 (1992-04-01), Kohlhaupt et al.
patent: 5112987 (1992-05-01), Yamamoto et al.
patent: 5116996 (1992-05-01), Kohlhaupt et al.
patent: 5116997 (1992-05-01), Kohlhaupt
patent: 5187283 (1993-02-01), Yamamoto et al.

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