Cosmetic methods of
skin lightening using
coumarin derivatives of formula I as
skin lightening agents alone or in combination with other
skin benefit agents and together with a
cosmetic vehicle: Where each or both R1 and / or R2 represents
hydrogen; linear or branched C1-C18
alkyl, alkenyl, cycloalkyl, cycloalkenyl, hydroxyalkyl, hydroxyalkenyl, acyl, cycloacyl, or alkoxy groups;Each or both R3 and / or R4, which may be connected by a single or double carbon-carbon bond (shown as a dotted line), represents
hydrogen; linear or branched C1-C18
alkyl, alkenyl, alkoxy, cycloalkyl, or cycloalkenyl group; andEach or both R5 and / or R6 represents a
hydrogen atom, OH, C1-C4
acyl group, C1-C4
alkyl group, O—CO—R7, O—COO—R8 group, mesyl group or
tosyl group, where each or both R7 and / or R8 represents hydrogen; linear or branched C1-C18 alkyl, alkenyl, hydroxyalkyl, hydroxyalkenyl, acyl, cycloacyl, or alkoxy groups.