Reactions of di(alkyn-1-yl)(chloro)silanes, HSi(Cl)(C≡C-R)2, R1Si(Cl)(C≡C-R)2 or HSi(Cl)-(C≡C-R)C≡C-Rʹ, with an excess of triethylborane, BEt3, proceed slowly (several days) at 100 -120 °C. Twofold 1,1-organoboration of HSi(Cl)(C≡C-R)2 or HSi(Cl)(C≡C-R)C≡C-Rʹleads tosiloles, independent of R = nBu, tBu, SiMe3. This provides the most straightforward way to silolesbearing both a hydrogen and a chlorine at the silicon atom. However, in the cases of R = Ph, BEt3 actsas 1,2-hydroborating reagent in the intermolecular first step of the reaction, leading to 1-silacyclobutene derivatives. All siloles and 1-silacyclobutene derivatives were characterized by multinuclear NMR spectroscopy (1H, 11B, 13C and 29Si). Comparable 1-silacyclobutene derivatives were formed using 9-borabicyclo[3.3.1]nonane, 9-BBN, as a well established 1,2- hydroborating reagent
二(炔基
氯基)
硅烷,HSi(Cl)(C≡C-R)2,R1Si(Cl)(C≡C-R)2或HSi(Cl)(C≡C-R)C≡C-Rʹ,与过量三乙基
硼烷,BEt3,在100-120°C下缓慢反应(几天)。HSi(Cl)(C≡C-R)2或HSi(Cl)(C≡C-R)C≡C-Rʹ的双倍1,1-有机
硼化导致
硅烯的形成,与R = nBu,tBu,SiMe3无关。这提供了
硅烯最直接的方法,
硅原子上同时带有氢和
氯。然而,在R = Ph的情况下,BEt3在反应的分子间第一步中作为1,2-氢硼试剂,导致1-
硅环丁烯衍
生物的形成。所有
硅烯和1-
硅环丁烯衍
生物都通过多核NMR光谱(1H,11B,13C和29Si)进行了表征。使用9-
硼杂双环[3.3.1]
壬烷,9-BBN,作为已建立的1,2-氢硼试剂,形成了可比较的1-
硅环丁烯衍
生物。