An unexpected Ir/Co dual catalytic hydroacylation of electron-deficient alkenes overcoming redox potential limitations is reported. In this protocol, Co(I) species are generated via photoreduction using Ir[dF(CF₃)ppy]₂dtbbpy, whose excited state has an oxidative potential (E_ox = −0.89 V vs. SCE) that is closer to or lower than the reduction potential of several effective salen-Co(II) catalysts (Co-1–Co-5: E^Co(II)/Co(I) = −0.80 to −1.36 V vs. SCE). The nucleophilic Co(I) species catalyzes the fragmentation of carboxylic anhydrides to release an acyl radical, which is subsequently captured by electron-deficient alkenes.

中文翻译：

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Ir/Co 双催化缺电子烯烃的加氢酰化克服了氧化还原电位的限制


据报道，缺电子烯烃的 Ir/Co 双催化加氢酰化克服了氧化还原电位的限制。在此协议中，Co()物种是使用 Ir[dF(CF ₃ )ppy] ₂ dtbbpy 通过光还原生成的，其激发态具有氧化电位 (E _ox = − 0.80 至 −1.36 V（相对于 SCE）。亲核Co()物种催化羧酸酐的裂解，释放酰基自由基，随后被缺电子烯烃捕获。