| 摘要 |
The present invention relates to a composition for the dyeing of keratinous fibres, especially human hair, which comprises, in a medium appropriate for dyeing:as coupler, at least one compound corresponding to one of the formulae:in which R1 is especially hydrogen, halogen, aryloxy, alkoxy, acyloxy, arylthio, alkylthio, heteroarylthio, heteroaryloxy, etc;R2 and R3 are independent and are especially hydrogen, halogen, alkyl, aryl, alkylthio, arylthio, benzylthio, etc;Za, Zb and Zc are independent and are a nitrogen atom or a carbon atom carrying a radical R4, R5, R6 or R7;R4, R6 and R7 are identical or different and are especially hydrogen, alkyl, aryl, a heterocycle, a halogen, etc; andR5 is especially hydrogen, halogen, acyl, acyloxy or carbamoyl, etc;and at least one oxidation base.
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