| abstract |
The subject of the present invention is symmetrical or asymmetric azomethine direct dyes, comprising at least one pyrazolopyridine unit of formula (I), a composition comprising said dyes, a process for treating keratinous fibers using said dyes, a process for the preparation of these compounds, synthetic intermediates and a kit. Formula (I) wherein X, Y1, Y2, Z1, R1 to R5 are as defined in the description. |