Symmetrical diazo compounds containing 2-pyridinium groups and cationic or non-cationic linker, compositions comprising them, method of coloring, and device

摘要

The present disclosure relates to symmetrical cationic diazo compounds of formula (I), the resonance forms, and also the acid addition salts and/or the solvates thereof: The present disclosure further relates to dyeing compositions comprising such compounds as a direct dye in a medium appropriate for the dyeing of keratin fibers, and also to a method of coloring keratin fibers that employs this composition, and a multi-compartment kit containing such compositions.