(DIS)SYMMETRIC AZOMETHINE-TYPE DIRECT DYE COMPRISING AT LEAST ONE PYRAZOLOPYRIDINE UNIT, PROCESS FOR DYEING KERATIN FIBERS USING THIS DYE

摘要

The subject of the present invention is symmetric or dissymmetric azomethine direct dyes comprising at least one pyrazolopyridine unit of formula (I), a composition comprising said dyes, a process for treating keratin fibers using said dyes, a process for preparing these compounds, synthesis intermediates and a kit. In which formula (I) X, Y1, Y2, Z1, and R1 to R5 are as defined in the description.