Nitroaminophenols, the process for preparation thereof and their use in dyeing keratinous fibres, and new intermediate nitroaminobenzenes and their use in dyeing keratinous fibres

A process for direct dyeing human hair comprising applying to said hair in an amount sufficient to dye said hair a composition comprising, in a cosmetically acceptable medium and in an amount ranging from 0.001 to 5 weight percent based on the total weight of said composition, at least one compound of formula II ##STR23## wherein R represents hydrogen, alkyl having 1-6 carbon atoms, hydroxyalkyl having 1-6 carbon atoms, polyhydroxyalkyl having 2-6 carbon atoms or alkoxy alkyl wherein the alkoxy moiety has 1-3 carbon atoms and the alkyl moiety has 1-6 carbon atoms, permitting said composition to remain in contact with said hair for a period of time ranging from 5 to 40 minutes, rinsing said hair and drying said hair.

A composition for dyeing human hair comprising in a cosmetically acceptable medium a hair dyeing amount of

• (i) at least one compound of formula I ##STR25## wherein Z represents --CH.sub.2 W wherein W represents hydrogen, alkyl having 1-6 carbon atoms, hydroxyalkyl having 1-6 carbon atoms, polyhydroxyalkyl having 2-6 carbon atoms, alkoxyalkyl wherein the alkoxy moiety has 1-3 carbon atoms and the alkly moiety has 1-6 carbon atoms or hydroxyalkoxyalkyl wherein the alkoxy moiety has 1-3 carbon atoms and the alkyl moiety has 1-6 carbon atoms, and
• R represents hydrogen, alkyl having 1-6 carbon atoms, hydroxyalkyl having 1-6 carbon atoms, polyhydroxyalkyl having 2-6 carbon atoms or alkoxyalkyl wherein the alkoxy moiety has 1-3 carbon atoms and the alkyl moiety has 1-6 carbon atoms, and
• (ii) at least one compound of formula (II') ##STR26## wherein R' represents hydroxyalkyl having 1-6 carbon atoms, polyhydroxyalkyl having 2-6 carbon atoms or alkoxyalkyl wherein the alkoxy moiety has 1-3 carbon atoms and the alkyl moiety has 1-6 carbon atoms.