Patent ID: 7179304

Claim:
A process for dyeing keratin materials, comprising applying to the keratin materials a composition comprising, in a medium appropriate for dyeing, at least one polycyclic aromatic vicinal trione of formula (I) or (II): wherein R 1 , R 2 , R 3 , R 4 , R 5 and R 6 , which may be identical or different, are chosen from hydrogen atoms; halogen radicals; C 1-6 alkyl radicals; hydroxyl radicals; C 1-6 alkoxy radicals; optionally substituted benzoxy radicals; optionally substituted aryloxy radicals; amino radicals; mono- and di(C 1-6 alkyl)amino radicals; mono- and di(C 1-6 hydroxy-alkyl)amino radicals; thio radicals; C 1-6 alkylthio radicals; C 1-6 thioalkyl radicals; (C 1-6 alkyl)carbonyl radicals; hydrogenocarbonyl radicals; hydroxycarbonyl radicals; (C 1-6 alkoxy)carbonyl radicals; nitro radicals; sulphonato radicals; tri(C 1-6 alkyl)ammonio radicals; and aromatic radicals comprising at least 5 members, that are monocyclic or polycyclic, comprising fused or non-fused rings, optionally comprising at least one heteroatom chosen from N, O, S and P, and optionally bearing at least one substituent chosen from halogen atom, C 1-6 alkyl, hydroxyl, C 1-6 alkoxy, amino, mono- and di(C 1-6 alkyl)amino, mono- and di(C 1-6 hydroxyalkyl)amino, thio, C 1-6 alkylthio, C 1-6 thioalkyl, (C 1-6 alkyl)carbonyl, hydrogenocarbonyl, hydroxycarbonyl, (C 1-6 alkoxy)carbonyl, nitro, sulphonato, tri(C 1-6 alkyl)ammonio, phenoxy, imidazolyl and pyridinyl radicals; alternatively, R 1 and R 2 , R 2 and R 3 , R 3 and R 4 , R 4 and R 5 , or R 5 and R 6 form together, in pairs, an entity chosen from —O—CH 2 —O— radicals; and aromatic and nonaromatic, 5- and 6-membered rings, optionally comprising at least one heteroatom chosen from N, O, S and P, and optionally bearing at least one substituent chosen from halogen atoms, C 1-6 alkyl, hydroxyl, C 1-6 alkoxy, amino, mono- and di(C 1-6 alkyl)amino, mono- and di(C 1-6 hydroxyalkyl)amino, thio, C 1-6 alkylthio, C 1-6 thioalkyl, (C 1-6 alkyl)carbonyl, hydrogenocarbonyl, hydroxycarbonyl, (C 1-6 alkoxy)carbonyl, nitro, sulphonato, tri(C 1-6 alkyl)ammonio, imidazolyl, and pyridinyl radicals, and A is chosen from aromatic and aliphatic polycyclic systems optionally comprising at least one heteroatom chosen from N, O, S and P and optionally bearing at least one substituent chosen from halogen atoms, and C 1-6 alkyl, hydroxyl, C 1-6 alkoxy, amino, mono- and di(C 1-6 alkyl)amino, mono- and di(C 1-6 hydroxyalkyl)amino, thio, C 1-6 alkylthio, C 1-6 thioalkyl, (C 1-6 alkyl)carbonyl, hydrogenocarbonyl, hydroxycarbonyl, (C 1-6 alkoxy)carbonyl, nitro, sulphonato, tri(C 1-6 alkyl)ammonio, phenoxy, imidazolyl, and pyridinyl radicals.