| abstract |
The present invention relates to a composition for dyeing keratinous fibers, especially human hair, which in a medium appropriate for dyeing comprises:as coupler at least one compound of formula: in which:R1 is especially hydrogen, alkyl, aryl, a heterocycle, a halogen, etc.;R2 is especially hydrogen, halogen, aryloxy, alkoxy, acyloxy, arylthio, alkylthio, heteroarylthio, heteroaryloxy, etc.;Za, Zb and Zc are independently a nitrogen atom or a carbon which carries a radical R3 or R4 whose meanings are identical to those of R1; at least one of Za, Zb and Zc is a nitrogen atom; and R3 and R4 may together form an unsubstituted or substituted aromatic ring; andat least one oxidation base. |