3-substituted para-aminophenols, process for preparing them, their use for dyeing keratinous fibres and the intermediate compounds used in the preparation process

摘要

3-Substituted para-aminophenols, process for preparing them, their use for dyeing keratinous fibres and the intermediate compounds used in the process of preparation. 3-Substituted para-aminophenols, of general formula: <IMAGE> (I) where X=H, halogen; Y=O-, -S-; R=alkyl, hydroxyalkyl, C1-4 aminoalkyl or C3-C6 polyhydroxyalkyl; with the proviso that, when X=H, R is not methyl, and when X=H and Y=O, R is not ethyl; process #or preparing them, intermediate compounds of formula: <IMAGE> (II) where X1=halogen, Y and R have the meaning stated above; with the proviso that, when Y=O, R is not methyl, and when R=aminoalkyl, X1 can also denote hydrogen; dyeing compositions containing one or more compounds of formula (I), and a process for dyeing human hair.