The invention concerns novel polyunsaturated compounds of formula (I) wherein: R1 represents a R&prime；1, -A-R&prime；1 group, R&prime；1 being selected from &mdash；COOH, &mdash；COOR3, &mdash；CONH2, &mdash；CONHR3, &mdash；CONR3 R4, &mdash；CHO, &mdash；CH2OH, &mdash；CH2OR5, and A represents a C2-C16 alkylene, alkenylene or alkynylene； R2 represents: an optionally substituted aryl group or an optionally substituted heteroaryl group； a sugar residue or, a fatty acid residue optionally branched and/or substituted preferably at the chain terminus and particularly by hydroxy, acetoxy radical or by an optionally protected amino radical； a &mdash；OC &mdash；(CH2)n CO-tocopheryl (alpha, beta or gamma or delta) group, with 2 $m(F) n $m(F) 10； a &mdash；R&prime；2&mdash；O&mdash；R6 group, wherein R&prime；2 is an optionally substituted arylene group or an optionally substituted heteroarylene group, and R6 represents a hydrogen atom, a straight or branched optionally substituted C 1-C 16 alkyl, a straight or branched optionally substituted C2-C16 alkenyl, or a straight or branched C2-C16 alkynyl group, an optionally substituted tocopheryl radical or the like, an amino acid residue, or a sugar residue. The invention also concerns the compositions, in particular cosmetic and/or dermatological compositions containing at least one compound of formula (I) as well as their use as whitening and/or depigmenting agent, and the cosmetic method using said compositions.
