Patent ID: 6837908

Claim:
A dyeing composition comprising, in a medium acceptable for dyeing, at least one oxidation base chosen from compounds of formula (I) and addition salts thereof: wherein Z 1 is chosen from OR 3 and NR 4 R 5 radicals; R 1 , R 2 , R 4 and R 5 , independently of one another, are chosen from a hydrogen atom, C 1 -C 6 alkyl radicals, C 2 -C 6 (poly)aminoalkyl radicals, C 2 -C 6 (poly)alkylaminoalkyl radicals, C 2 -C 6 aminohydroxyalkyl radicals, C 2 -C 6 acylaminoalkyl radicals, C 2 -C 6 alkoxyalkyl radicals, C 2 -C 6 hydroxyalkoxyalkyl radicals, C 2 -C 6 aminoalkoxyalkyl radicals, C 2 -C 6 (poly)hydroxyalkyl radicals, C 2 -C 6 carboxylalkyl radicals and C 2 -C 6 sulphoalkyl radicals; or R 1 and R 2 may form, together with the nitrogen atom to which they are attached, a saturated heterocycle comprising from 5 to 8 ring members optionally substituted by at least one radical chosen from halogen atoms, amino, (di)alkylamino, hydroxyl, carboxyl, carboxamido, alkylsulphonylamino, acetamido and alkoxy radicals, and C 1 -C 6 alkyl radicals optionally substituted by at least one radical chosen from hydroxyl, amino, (di)alkylamino, alkoxy, hydroxyalkoxy, aminoalkoxy, carboxyl, carboxamido, sulphonamido and sulpho radicals, wherein the heterocycle optionally comprises at least one group chosen from heteroatoms chosen from oxygen, optionally substituted nitrogen and sulphur and an SO 2 group, with the proviso that the heterocycle does not comprise a peroxide bond or a diazo or a nitroso radical; or independently, R 4 and R 5 may form, together with the nitrogen atom to which they are attached, a saturated heterocycle comprising from 5 to 8 ring members optionally substituted by at least one radical chosen from halogen atoms, amino, (di)alkylamino, hydroxyl, carboxyl, carboxamido, alkylsulphonylamino, acetamido and alkoxy radicals, and C 1 -C 6 alkyl radicals optionally substituted by at least one radical chosen from hydroxyl, amino, (di)alkylamino, alkoxy, hydroxyalkoxy, aminoalkoxy, carboxyl, carboxamido, sulphonamido and sulpho radicals, wherein the heterocycle optionally comprises at least one group chosen from heteroatoms chosen from oxygen, optionally substituted nitrogen and sulphur and an SO 2 group, with the proviso that the heterocycle does not comprise a peroxide bond or a diazo or a nitroso radical; R 3 is chosen from linear and branched C 1 -C 6 alkyl radicals optionally substituted by at least one radical chosen from hydroxyl, amino, C 1 -C 3 mono- and dialkylamino radicals, wherein an alkyl part of the at least one radical is optionally substituted by at least one radical chosen from hydroxyl, amino, C 1 -C 2 alkoxyalkoxy, and carboxyl radicals, with the proviso that the at least one oxidation base is not chosen from 2,3,6-triaminopyridine and addition salts thereof.