cross-cycloaddition has been developed in the presence of a thioxanthylium photoredox catalyst. Electron-rich styrenes such as β-bromostyrene (Ep/2 = +1.61 V vs SCE) were selectively oxidized by a thioxanthylium photoredox catalyst (E1/2 (C*/C•–) = +1.76 V vs SCE) to styryl radical cations and reacted with styrene (Ep/2 = +1.97 V vs SCE) to furnish polysubstituted cyclobutanes in high yields. The present reaction
在
噻吨锡光氧化还原催化剂的存在下,已经开发了氧化还原电势控制的分子间[2 + 2]交叉环加成反应。富含电子的
苯乙烯(例如
β-溴苯乙烯)(E p / 2 = +1.61 V vs SCE)被
硫代
蒽醌光氧化还原催化剂(E 1/2(C * / C •–)= +1.76 V vs SCE)选择性氧化为苯
乙烯基阳离子与
苯乙烯反应(E p / 2 = +1.97 V vs SCE),以高收率提供多取代的
环丁烷。本反应可成功地用于β-卤代
苯乙烯的分子间[2 + 2]交叉环加成,这是迄今为止报道的代表性有机光氧化还原催化剂无法有效实现的。