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:
Zeitschrift für anorganische und allgemeine Chemie
影响因子:
--
通讯作者:
W. Milius
W. Milius
中科院分区:
--
文献类型:
--
作者:
B. Wrackmeyer;E.V. Klimkina;W. Milius

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主要采用盐消除法合成了非环状和环状硅烷基取代的1,2-二碳-环-十二硼烷(12)衍生物。几种已知的和新的化合物的结构通过固态X射线分析和溶液中的多核核磁共振(1H,11B,13 C,29 Si,77 Se和125 Te NMR)进行了表征。这包括作为非环状化合物的实例的1,2-双(三甲基甲硅烷基)和1,2-双(氯二甲基甲硅烷基)衍生物以及一系列1,1,3,3-四甲基-4,5-[1,2-二碳-环-十二硼烷(12)]-1,3-二硅杂-2-元素-环戊烷(元素= S、Se、Te)。许多自旋-自旋耦合常数与它们的符号一起被确定。通过计算[B3 Lyp/6 - 311+G(d,p)]优化了所研究的大多数化合物的分子气相几何构型,并在相同的理论水平上计算了NMR参数。对于几个实例,成功地探索了甲硅烷基取代的邻位碳硼烷转化为它们各自的7,8-二碳酰亚胺-十一硼酸酯(1-)衍生物。
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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