Substituted 4-amino-3-nitrophenols, processes for their preparat

Details Substituted 4-amino-3-nitrophenols, processes for their preparat Substituted 4-amino-3-nitrophenols, processes for their preparat

1984-01-19

1986-03-11

Warren, Charles F.

Bleaching and dyeing; fluid treatment and chemical modification

Dyeing involving animal-derived natural fiber material ,...

Hair dyeing

8421, 564441, A61K 713, C07C 8760

Patent

active

045753784

ABSTRACT:
The invention relates to new 3-nitro-4-aminophenols of the formula (I) ##STR1## in which R denotes hydrogen or halogen, preferably chlorine or bromine, and R' denotes hydrogen or alkyl, hydroxyalkyl, dihydroxyalkyl or halogenohydroxyalkyl which has 1 to 6 carbon atoms and is straight-chain or branched, with the proviso that, if R is hydrogen, R' does not denote hydrogen, methyl or .beta.-hydroxyethyl.
Processes for their preparation: (a) by reacting corresponding 3-nitro-4-aminophenols with certain halogenoalkyl chloroformates and subsequent basic treatment of the process products, or (b) by reacting corresponding 4-halogeno-3-nitrophenols with certain amines, and the intermediate products obtained and coloring agents for keratinic fibres, preferably for human hair, which contain at least one compound of the formula (I).

REFERENCES:
patent: 2750326 (1956-06-01), Eckardt
patent: 4125601 (1978-11-01), Bugant et al.
Van Erp, Chem. Abstracts, vol. 24, p. 4282, Halogenated Nitrophenols.

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