NOVEL UNSATURATED BENZYLIDENE-3 CAMPHRE DERIVATIVES, PROCESS FOR THEIR PREPARATION AND THEIR USE AS COSMETIC ULTRA VIOLET RADIATION BEHAVIORS AND AS SYNTHETIC INTERMEDIATES OF ORGANO-SILICIC COMPOUNDS

摘要

The invention relates to an unsaturated derivative of benzylidene-3-camphor characterized in that it corresponds to the formula: ## STR2 ## wherein R 1 represents: ## STR2 ## P - a hydrogen atom, a C 1 -C 6 alkyl radical, a C 1 -C 6 alkoxy radical or a radical - (O) n - (CH 2) p -C (R 4) = CH 2 in which n = 0 or 1, p represents an integer between 1 and 10 and preferably between 1 and 4 and R4 represents a hydrogen atom or a C1-C4 alkyl radical; R2 represents a hydrogen atom, a C1-C6 alkyl radical, a C1-C6 alkoxy radical or a radical - (CH2) p -C (R4) = CH2 in which p and R4 have the meanings mentioned above; ; R3 represents a hydrogen atom, a C1-C6 alkyl radical or a C1-C6 alkoxy radical; with the proviso that one of the radicals R 1 or R 2 respectively represents a radical - (O) n - (CH 2) p -C (R 4) = CH 2 or a radical - (CH 2) p -C (R 4) = CH 2 in which n , p and R4 have the meanings indicated above; / P P - its preparation process and its use as a sunscreen and synthesis intermediate. / P