Cobalt-Hydride-Catalyzed Hydrosilylation of 3‑Alkynes Accompanying π‑Bond Migration

We describe a protocol for cobalt-catalyzed hydrosilylation of 3-alkynes with accompanying π-bond migration. Mechanistic studies indicate that (i) cobalt­(I)-hydride bearing a bulky bisphosphine ligand is the key intermediate and (ii) π-bond migration occurs prior to hydrosilylation. The cascade process selectively furnishes terminal branched allylsilanes under mild conditions.本研究报道了一种伴随π键迁移的钴催化3-炔烃硅氢化反应方案。机理研究表明：(i) 带有大位阻双膦配体的一价钴氢化物为关键中间体；(ii) π键迁移过程发生于硅氢化反应之前。该串联反应可在温和条件下选择性生成末端支链烯丙基硅烷。