Patent · US Expired

Substituted 4-amino-3-nitrophenols, processes for their preparation and hair-coloring agents containing these compounds

US4575378A · kind A · utility

4Cited by

2References

9Claims

0Family size

Assignee

Hans Schwarzkopf GmbH · DE

Inventors

Winfried Seidel · Obertshausen, DE
Thomas Oelschlager · Norderstedt, DE
Wolfgang Schlenther · Hamburg, DE

Key dates

Filing date	Jan 19, 1984
Grant date	Mar 11, 1986
Priority date	—
Expiry date	Jan 19, 2004

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61Q5/10
WIPO fieldPharmaceuticals
WIPO sectorChemistry

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).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.