Substituted p-phenylenediamine as a new oxidation dye precursors of the developer type

The invention relates to agents for the oxidative color change of keratinic fibers, in particular human hair, containing in a cosmetic carrier, at least one oxidation dye precursor of formula (I) and / or its physiologically acceptable salt, wherein R1, R2, R3, R4 independently represent a hydrogen atom, a C n is an integer from 2 to 6 and Z represents an aromatic or aliphatic heterocycle or an aromatic or aliphatic carbocycle is. A second object of the present invention are compounds of formula (I) itself.