Direct dyes of the azomethine type with (imperfect) symmetry comprising at least one pyrazolopyridine unit, a method for dyeing keratin fibers using this dye
The subject of the present invention is a symmetric or incompletely symmetric azomethine direct dye comprising at least one pyrazolopyridine unit of formula (I), a composition comprising said dye, treating keratin fibers using said dye Methods, methods for preparing these compounds, synthetic intermediates and kits. In the formula (I), X, Y1, Y2, Z1, and R1 to R5 are as defined in this specification.本発明の主題は、少なくとも１種の式（Ｉ）のピラゾロピリジン単位を含む対称性又は不完全対称性アゾメチン直接染料、前記染料を含む組成物、前記染料を使用してケラチン繊維を処理するための方法、これらの化合物を調製するための方法、合成中間体及びキットにある。式（Ｉ）中、Ｘ、Ｙ１、Ｙ２、Ｚ１及びＲ１～Ｒ５は本明細書に定義した通りである。
