| abstract |
The present invention relates to symmetric cationic diazo compounds of formula (I), their resonance forms, and their acid addition salts and solvates thereof:n n n n n n n n Wherein the homologous W 1 radical is a hydrogen atom; a halogen atom selected from bromine, chlorine and fluorine, preferably chlorine and fluorine; or —NR 5 R 6 , OR 7 , —NR 4 —Ph-NR 5 R The non-cationic linker L, which represents a 6 , -NR 4 -Ph-OR 7 , -O-Ph-OR 7 or -O-Ph-NR 5 R 6 group and connects two homologous azo chromophores, is cationic or not Can be).n n n A dyeing composition containing such a compound as a dye directly in a medium suitable for dyeing keratinous fibers, a method for coloring keratinous fibers using the composition, and an apparatus having a plurality of compartments.n n n Dyeing compositions, dyes |