COMPOUND USED AS COOPER IN DYING BY OXIDATION OF KERATIN FIBERS USING OXIDATION DYE PRECURSOR FOR AND / OR ORT, DYE COMPOSITION FOR KERATIN FIBERS, IN PARTICULAR OF HUMAN HAIR, AND NEW COMPOUND

摘要

The invention relates to the use of compounds for fibres corresponding to the formula: IMAGE in which R1 denotes a hydrogen atom, a C1-C4 alkyl radical; R2 and R3, which may be identical or different, denote a hydrogen atom, a C1-C4 lower alkyl radical, a carboxyl radical or an alkoxycarbonyl radical; X denotes a C1-C4 lower alkyl radical, a C1-C10 alkoxy radical, a halogen atom, a C1-C20 acyloxy radical, an acetylamino group, a trimethylsilyloxy group or a di(C1-C4 alkyl)aminomethyl group, as couplers in oxidation dyeing compositions for keratinous fibres, the OH group occupying positions 6 or 7, as well as their salts.