SPECIFIC MONOCATIONIC MONOCHROMOPHORIC COMPOUNDS OF HYDRAZONE TYPE COMPRISING A 2-, 4-PYRIDINIUM OR 2-, 4-QUINOLINIUM UNIT, SYNTHESIS THEREOF, DYE COMPOSITIONS CONTAINING THEM, AND METHOD FOR DYEING KERATIN FIBRES

摘要

The present invention relates to monocationic monochromophoric compounds of formulae (I) and/or (II), in which R1 is a hydrogen or an alkyl, phenyl, benzyl, alkylcarbonyl, alkylsulfonyl, aminosulfonyl or aminocarbonyl radical; R5 is an alkyl, phenyl or benzyl; R2 and R3 are a halogen, or an alkyl, aryloxy, arylamino, hydroxyl, alkoxy, (poly)hydroxyalkoxy, alkoxycarbonyl, alkylcarbonyloxy, amino, alkylcarbonylamino, aminocarbonyl, ureido, aminosulfonyl, alkylthio, alkylsulfonylamino, cyano, trifluoromethyl, thio, alkylsulfinyl or alkylsulfonyl radical; R4 is a hydrogen or an alkyl, amino, alkylcarbonylamino, ureido, alkylsulfonylamino, hydroxycarbonyl, alkoxycarbonyl, cyano, phenyl or benzyl radical; R6 and R7 are a hydrogen or an alkyl, alkylcarbonyl, alkoxycarbonyl, alkoxyaryl, aminoaryl, aminocarbonyl or alkylsulfonyl radical, n is between 0 and 4, and n' is between 0 and 4, wherein the electroneutrality of the compounds of formulae (I) and (II) is provided by one or more cosmetically acceptable anions An. It also relates to dye compositions containing said compounds as direct dye, and also to a method for dyeing keratin fibres using this composition and to a multicompartment device. Finally, it relates to methods for synthesizing the compounds of formulae (I) and/or (II).