Molecular Structures, Reactivity, and NMR Spectroscopic Studies of Cyclic and Non-cyclic Silyl-substituted 1, 2-Dicarba-closo-dodecaborane(12) Derivatives †
Molecular Structures, Reactivity, and NMR Spectroscopic Studies of Cyclic and Non-cyclic Silyl-substituted 1, 2-Dicarba-closo-dodecaborane(12) Derivatives †
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环状和非环状甲硅烷基取代的 1, 2-Dicarba-closo-dodecborane(12) 衍生物的分子结构、反应性和 NMR 波谱研究 â
DOI:
10.1002/zaac.201200027
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发表时间:
2012
期刊:
影响因子:
--
通讯作者:
W. Milius
中科院分区:
文献类型:
--
作者:
B. Wrackmeyer;E.V. Klimkina;W. Milius
Non‐cyclic and cyclic silyl‐substituted 1, 2‐dicarba‐closo‐dodecaborane(12) derivatives were prepared mainly by salt elimination methods. Several known and new compounds were structurally characterized by X‐ray analysis in the solid state and by mulinuclear magnetic resonance (1H,11B,13C,29Si,77Se, and125Te NMR) in solution. This includes the 1, 2‐bis(trimethylsilyl) and 1, 2‐bis(chlorodimethylsilyl) derivatives as examples for non‐cyclic compounds and a series of 1, 1, 3, 3‐tetramethyl‐4, 5‐[1, 2‐dicarba‐closo‐dodecaborano(12)]‐1, 3‐disila‐2‐element‐cyclopentanes (element = S, Se, Te). Numerous spin‐spin coupling constants were determined together with their signs. Molecular gas phase geometries for most compounds studied were optimized by calculations [B3Lyp/6‐311+G(d, p)], and NMR parameters were calculated at the same level of theory. The conversion of silyl‐substitutedortho‐carboranes into their respective 7, 8‐dicarba‐nido‐undecaborate(1‐) derivatives was explored successfully for several examples.
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