AbstractDiscovering new bonding scenarios and subsequently exploring the reactivity contribute substantially to advance the main group element chemistry. Herein, we report on the isolation and characterization of an intriguing class of the hydrido‐benzosiloles 2–4. These compounds exhibit a side arm of the amidinatosilylenyl group, featuring unidirectional silicon(II)/silicon(IV) donor‐acceptor interaction on account of the geometric constraint. Furthermore, the reactions involving 2–4 with nitriles yield the tricyclic compounds that edge‐fused of the Si‐heteroimidazolidine‐CN2Si2, silole‐C4Si, and phenyl‐C6‐rings (5–13). These compounds are manifesting a unique reaction that the silicon(II)/silicon(IV) interaction enables the enamination of the α‐H‐bearing nitriles. The reaction mechanism involved in H‐shift under oxidative addition at silylene followed by hydrosilylation of a ketenimine intermediate was revealed by density function theory (DFT) calculations.
摘要发现新的成键方式并随后探索其反应性对推动主族元素化学的发展具有重大意义。在此,我们报告了一类引人入胜的氢rido-苯并硅烷 2-4 的分离和表征。这些化合物展示了脒基硅烯基的侧臂,由于几何约束,具有单向硅(II)/硅(IV)供体-受体相互作用的特点。此外,2-4 与腈的反应还产生了三环化合物,这些化合物由硅-异咪唑烷-CN2Si2、硅烯-C4Si 和苯基-C6 环边缘融合而成(5-13)。这些化合物表现出一种独特的反应,即硅(II)/硅(IV)的相互作用使含α-H 的腈类化合物发生烯化反应。密度函数理论(DFT)计算揭示了在硅烷基氧化加成下发生 H 移位,然后酮亚胺中间体发生氢硅化的反应机理。