Diaminopyrazole compounds and the use thereof in the oxidation dyeing of keratinous fibres

摘要

The invention relates to novel diaminopyrazole compounds having formula (I): wherein R₁ represents a linear or branched C₄-C₅ alkyl or n-propyl group, or a linear or branched C₃-C₅ mono or polyhydroxy alkyl group, and the addition salts thereof with a physiologically acceptable acid. The invention also relates to the compositions containing such a compound for the dyeing of keratinous fibres and the method for using said compositions.