When the irradiation is carried out in the presence of electron-withdrawing substituted alkenes, the radical is trapped and the adduct radical either couples with TCB-• (the overall process is then radical olefin coupling - aromatic substitution) or is reduced by it (resulting in TCB photosensitized alkene alkylation). The effect of the radical precursor structure and of the medium on these new reaction
在几个供体的存在下1,2,4,5- benzenetetracarbonitrile(
TCB)(一些2-照射吨丁基-
1,3-二氧戊环,
新戊酸,吨-butyltrimethylstannane,吨丁基二Ñ辛基醚)引线使供体自由基阳离子断裂,得到叔丁基。当在吸电子取代的烯烃的存在下进行辐照时,自由基被捕集,加合物自由基与
TCB- •偶联。(然后整个过程是自由基烯烃偶联-芳族取代)或被还原(导致
TCB光敏烯烃烷基化)。讨论了自由基前体结构和介质对这些新反应的影响。