Sunscreen compounds

摘要

The invention relates to sunscreen compounds of formula I I wherein R1 is selected from alkyl, alkenyl, alkynyl substituted alkyl, substituted alkenyl, phenyl, substituted phenyl, substituted benzyl, cycloalkyl, cycloalkenyl, substituted cycloalkyl, substituted cycloalkenyl; R2 is selected from hydrogen, alkyl and alkoxy; R3 is selected from alkyl, substituted alkyl, alkenyl, substituted alkenyl, alkynyl, phenyl, benzoyl, substituted phenyl, substituted benzyl, substituted benzoyl, cycloalkyl, substituted cycloalkyl, cycloalkenyl, substituted cycloalkenyl, alkanyoyl, substituted alkanoyl, the group OROROR9 wherein R is a bivalent hydrocarbon radical and R9 is alkyl, alkenyl, phenyl benzyl, substituted phenyl, substituted benzyl; R4 is alkyl or alkoxy; n is an integer from 0 to 4; and R5 and R6 are independently selected from alkyl, alkoxy, alkanoyl, alkanoyl substituted by hydroxyl or alkoxycarbonyl.