| abstract |
SPECIFIC The invention relates to novel sulfonamide derivatives 3-benzylidene camphor, corresponding to the general formula: (I) in which X1 denotes a hydrogen atom or the radical Y; X2 denotes a hydrogen or halogen atom, a radical C1-C4 alkyl or alkoxy or a radical Y or Z; X3 denotes a hydrogen or halogen atom, an alkyl radical or C1-C4 alkoxy or a Y or Z radical; either X2 or X3 form together a dioxy alkylene group containing 1 or 2 atoms of carbon; Y denotes the group in which R1 denotes a hydrogen atom or an alkyl radical or C1-C4 hydroxyalkyl; R2 denotes a hydrogen atom, a linear or branched alkyl or alkenyl radical, cycloalkyl, aryl or aralkyl, these different radicals containing 1 to 20 carbon atoms and may be substituted by one or more if hydroxy, alkoxy or dialkylamino groups, R1 and R2 do not can simultaneously denote a hydrogen atom; Z denotes a group: Z1 = where Y has the above meaning, or Z2 = or Z3 = where R3 denotes a hydrogen atom, a -CN or -COR5 radical; R4 denotes a radical -COR6, R5 and R6, identical or different, being C1-C20 alkoxy or alkylamino groups; to the provided that one of the symbols Xl, X2 and X3 is different of the other two and that (a) when X1 denotes an atom of hydrogen, X2 and X3 are different from each other and do not cannot take the values Z2 and Z3, one of the two having necessarily the value Y or Z1; and (b) when X1 has the value Y, X2 and X3 are different from Y and cannot simultaneously take the value Z1 or Z2 or Z3. Compounds according to the invention are useful as sun filters, especially in the cosmetic field. They are excellent absorbers of ultraviolet radiation in a wide range of wavelengths ranging from 280 to 380 nm, and present by elsewhere an excellent fat-soluble character, a stability to light and remarkable thermal stability. |