photoredox system. Moreover, the reaction intermediate vinylcyclobutane is captured and monitored during the reaction, serving as a direct evidence for the proposed reaction mechanism. The cycloaddition process is thereby determined to be the combination of direct [4+2] cycloaddition and [2+2] cycloaddition followed by photocatalytic rearrangement of the vinylcyclobutane intermediate.
石墨碳
氮化物(g-C 3 N 4)在可见光辐射和有氧条件下,与富电子烯烃的光催化Diels-Alder(D-A)反应得以实现。这种异质的光氧化还原反应系统非常高效,模型反应的表观量子产率达到了47%的显着值。双氧作为电子介体起着至关重要的作用,这与先前有关均相Ru II的报道不同复杂的光氧化还原系统。此外,在反应过程中捕获并监测了反应中间体
乙烯基环丁烷,为提出的反应机理提供了直接证据。从而将环加成过程确定为直接的[4 + 2]环加成和[2 + 2]环加成,然后进行
乙烯基环丁烷中间体的光催化重排的组合。