o‐C6H4(SiR3−nHn)(BMes2) (1; R=Me, Ph; n=1, 2) undergo MesH (Mes=mesityl) ligand exchange between the silicon atom and the boron atom to form o‐C6H4(SiMesR3−nHn−1)(BMesH) (6) upon heating. The resulting hydroborane intermediates (6) immediately react with benzaldehyde to afford their corresponding benzyloxyboranes (5). A DFT study of model compounds reveals the transition states of the ligand exchange
ø -C 6 ħ 4(SIR 3 - ñ ħ Ñ)(BMES 2)(1 ; R = Me中的Ph值; Ñ = 1,2)经历的Mes H(的Mes =异亚丙基丙酮)中的硅原子和配位体之间交换硼原子在加热时形成o ‐ C 6 H 4(SiMesR 3 − n H n − 1)(BMesH)(6)。生成的氢硼烷中间体(6)立即与苯甲醛反应,得到其相应的苄氧基硼烷(5)。DFT对模型化合物的研究揭示了配体交换的过渡态。硼中心从硅原子中提取氢化物是达到过渡态的关键,其中包括三配位的甲硅烷基阳离子部分和四配位的硼氢化物部分。