Process for the preparation of acid nitro dyestuffs

Details Process for the preparation of acid nitro dyestuffs Process for the preparation of acid nitro dyestuffs

1984-05-10

1986-07-08

Clingman, A. Lionel

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

Organic compounds

Amino nitrogen containing

8436, 8649, 564441, 564442, C07C 8750

Patent

active

045994501

ABSTRACT:
Acid nitro dyestuffs are prepared by treating aminonitrodiphenylaminesulfonic acids with an oxidizing agent in an aqueous medium, the oxidizing agent employed being a manganese-(VI) or manganese-(VII) compound and the reaction being carried out at a pH higher than 5 and at a temperature between 20.degree. and 100.degree. C. The dyestuffs thus obtainable dye even fresh full-grained chrome leather in full shades.

REFERENCES:
patent: 1618415 (1927-02-01), Ellis
patent: 3909190 (1975-09-01), Saygin

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