| 摘要 |
Siloxane or silane derivatives (I) of 2-benzoheterocyclyl benzoxazole, benzothiazole or benzimidazole compounds are new. Compounds (I) which are either silicones comprising units of formula (Ia) or silanes of formula (Ib) are new: R = 1-30C (un)saturated hydrocarbyl, 1-8C halohydrocarbyl or trimethylsilyloxy; a = 1 or 2; R'1-R'3 = 1-8C alkyl, 2-8C alkenyl or trimethylsilyloxy; A = a group of formula (i): L = a linking group; R1, R2 = 1-10C alkyl or 1-8C alkoxy, or two adjacent R1 or R2 groups can form 1-2C alkylidenedioxy; X, Z = O, S, NH, NR3 or N-L; Y = N or CR4; R3 = 1-10C alkyl, 6-12C aryl or 1-10C alkoxycarbonyl; R4 = H, Me or Et; n, m = 0-2. Independent claims are also included for the following: (1) a process for preparing compounds (I); (2) a plastics composition containing at least one compound (I); (3) a cosmetic composition for protecting the skin and/or hair against ultraviolet radiation, comprising at least one compound (I) and a carrier.
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