| 摘要 |
Compounds of the formula I <IMAGE> are described in which L denotes H or CO-(R<1>)n(CX3)m, M denotes alkylene, alkenylene or arylene, Q denotes S, Se, O, dialkylmethylene, alken-1,2-ylene, 1,2-phenylene or N-R, where M + Q together form 3 or 4 ring members, R denotes alkyl, aralkyl or alkoxyalkyl, R<1> denotes an aromatic group, and X denotes Cl, Br or I and n = 0 and m = 1 or n = 1 and m = 1 or 2. The compounds eliminate HX on irradiation and form radicals. They are therefore highly active acid donors and radical initiators for photochemical processes. |
