The novel derivatives unsaturated - 3 benzylidene camphor, their process of preparation and their use as the ultra - violet radiation absorbers in, and as # # synthesis of compounds organo silicic -

摘要

The invention relates to an unsaturated derivative of the - 3 benzylidene camphor characterized by the fact that it satisfies the formula: & br / (see appended drawing in bopi) & br / in which r1 represents: / p & & p & - a hydrogen atom, an alkyl radical at c1 - c6, an alkoxy radical c1 - c6 or a radical - (0) n - (ch2), p - c (r4) = ch2, 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 an alkyl radical at c1 - c4, r2 represents a hydrogen atom, an alkyl radical at c1 - c6, an alkoxy radical c1 - c6 or a radical - (ch2), p - c (r4) = ch2, in which p and r4 have the meanings stated above -; r3 represents a hydrogen atom, an alkyl radical at c1 - c6 or an alkoxy radical c1 - c6, provided that one of the radicals r1 and r2 respectively represents a radical - (0) n - (ch2), p - c (r4) = ch2 or a radical - (ch2), p - c (r4) = ch2 in which n, p and r4 have the meanings stated above -; / p & & p & - its preparation process and its use as a sunscreen and synthesis intermediate.