Transition metal-catalyzed allylations are among the most important tools for the formation of chemical bonds. Unlike soft nucleophiles (pK_a < 25), reactions of hard nucleophiles (pK_a > 25) usually suffer from requiring organometallic reagents or the use of strong bases. In addition, traditional single-electron allylations always require rigorously controlled reaction conditions as well as the use of a stoichiometric reductant that often reduces functional group tolerance. Single-electron allylation reactions facilitated by synergistic transition-metal catalysis and visible light photocatalysis, however, can provide complementary advantages over traditional allylations. From this perspective, we highlight the recently discovered single-electron allylation reactions exploiting this synergistic catalysis strategy.

过渡金属催化的烯丙基化是形成化学键最重要的工具之一。与软亲核试剂（p K _a <25）不同，硬亲核试剂（p K _a> 25）通常需要有机金属试剂或使用强碱。另外，传统的单电子烯丙基化总是需要严格控制反应条件以及使用化学计量还原剂，该化学计量还原剂通常会降低官能团的耐受性。然而，协同过渡金属催化和可见光光催化促进的单电子烯丙基化反应可提供优于传统烯丙基化的互补优势。从这个角度出发，我们重点介绍了利用这种协同催化策略最近发现的单电子烯丙基化反应。