Patent ID: 8617524

Claim:
A method for depigmenting, lightening and/or bleaching a keratin substrate, comprising topically applying thereon a thus effective amount of a cosmetic composition which comprises at least one compound of formula (I): in which: Y is O, NR 1 or S R 1 is a hydrogen atom; a saturated linear C 1 -C 20 or branched C 3 -C 20 or unsaturated C 2 -C 20 alkyl hydrocarbon-based radical; a phenyl radical optionally substituted with one or more hydroxyl groups and/or with one or more C 1 -C 8 alkoxy radicals; R is a hydrogen atom; or a saturated linear C 1 -C 20 or branched C 3 -C 20 or unsaturated C 2 -C 20 alkyl hydrocarbon-based radical, or a phenyl radical optionally substituted with one or more hydroxyl groups and/or with one or more C 1 -C 8 alkoxy radicals, or a saturated C 1 -C 8 alkyl radical containing a phenyl substituent optionally substituted with one or more hydroxyl groups and/or with one or more C 1 -C 8 alkoxy radicals; R optionally bears one or more substituents selected from the group consisting of OR 2 , SR 2 , NR 2 R 3 , COOR 2 in which: R 2 is a hydrogen atom or a saturated linear C 1 -C 5 or branched C 3 -C 5 or unsaturated C 2 -C 5 hydrocarbon-based radical, or a phenyl radical; R 3 is a hydrogen atom, a saturated linear C 1 -C 5 or branched C 3 -C 5 or unsaturated C 2 -C 5 hydrocarbon-based radical, a phenyl radical, or an acetyl radical; with the proviso that when Yâ•NR 1 , R and R 1 may together form a ring member selected from the group consisting of pyrrolidine, pyrroline, piperidine, piperazine, morpholine, thiomorpholine and azepine; n=0 or 1 or 2; or a salt, chelate, solvate or optional isomer thereof, formulated into a topically applicable, physiologically acceptable medium therefor.