Paraphenylene diamine compounds (I) and their addition salts are new. Paraphenylene diamine compounds of formula (I) and their addition salts are new. R : 4-7 membered ring (optionally containing O or N, and optionally substituted); R 1, R 2H or 1-6C alkyl (optionally substituted by OH, 1-4C alkoxy, amino or (di) 1-4C alkyl amino); X, Y 11-10C alkylene or a covalent bond; R 11, R 211-6C (hydroxy)alkyl, 1-6C (hydroxy)alkoxy or 1-6C alkoxy 1-6C alkyl; and n, m : 0-4. Provided that (I) is not N-(4-aminophenyl)-N-[(4-{[(4-aminophenyl)amino]methyl}cyclohexyl)methyl]amine. Independent claims are included for: (1) the preparation of (I); (2) an intermediate nitro compound of formula (II); (3) a dye composition comprising an oxidation base of (I) in a medium; (4) a dyeing process of human keratinous fibers i.e. hair, comprising applying the dye composition on hair in the presence of an oxidizing agent up to the development of a desired color; and (5) a kit having several compartments comprising the dye composition in a first compartment and an oxidizing agent in a second compartment. Provided that (II) is not 2,4-bs-(4-nitro-phenylamino)-cyclobutane-1,3-dione or N,N'-diethyl-N,N'-bis-(4-nitro-phenyl)-[1,2,4,5]tetroxane-3,6-diamine. [Image] [Image].
Double para-phenylenediamines joined by a linker comprising a saturated cyclic radical and use thereof as dyeing agents