Triethylborane (1) or trivinylborane (2) reacts with di(alkyn-1-yl)methylsilanes, MeSiH(C≡C-R)2 3 [R = Bu (a), t-Bu (b), SiMe3 (c)], to give the novel chiral 1-silacyclopenta-2,4-dienes (siloles) 4a-4c or 5a-5c, respectively, by twofold 1,1-organoboration. Similarly, di(alkyn-1-yl)dimethylsilane Me2Si(C≡C-t-Bu)2 3d reacts with 2 to give the silole 5d. These are the first applications of 2 in 1,1-organoboration reactions. All products are characterized by multinuclear magnetic resonance (1H, 11B, 13C, 29Si NMR).
三乙基硼(1)或三乙烯基硼(2)与二(炔基-1-基)甲基硅烷MeSiH(C≡C-R)2 3 [R = Bu(a),t-Bu(b),SiMe3(c)]反应,通过双重1,1-有机硼化作用分别生成新型手性1-硅杂环戊二烯(硅烯)4a-4c或5a-5c。类似地,二(炔基-1-基)二甲基硅烷Me2Si(C≡C-t-Bu)2 3d与2反应,生成硅烯5d。这些是2在1,1-有机硼化反应中的首次应用。所有产物均通过多核磁共振(1H、11B、13C、29Si NMR)进行表征。