competition with reversible insertion into one of the B–Se bonds (selenoboration) to afford a seven-membered ring and finally, by elimination of Me3Si–X (X = Cl, Br, I), the corresponding B-alkynyl derivatives. The reactions were monitored by NMR spectroscopy (11B, 13C, 29Si and 77Se NMR). The proposed solution-state structures are also supported by DFT calculations of single molecule geometries and NMR
摘要 炔基
硅烷的 C≡C 键与 2-halogeno-1,3,2-diselenaborolano-4,5-[1,2-dicarba-closo-ddecaborane(12)] 发生 1,2-卤化反应,与可逆的插入其中一个 B-Se 键(
硒硼化)以提供七元环,最后通过消除 Me3Si-X(X = Cl、Br、I),产生相应的 B-炔基衍
生物。通过NMR光谱(11B、13C、29Si和77Se NMR)监测反应。所提出的溶液状态结构也得到了单分子几何形状和 NMR 参数的 DFT 计算的支持 [B3LYP/6-311 + G(d,p) 理论
水平]。