Cationic Chains of Parent Arsanylboranes and Substituted Phosphanylboranes.

Cationic Chains of Parent Arsanylboranes and Substituted Phosphanylboranes.
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母体胂硼烷和取代的膦基硼烷的阳离子链

DOI:
10.1002/chem.201702384
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
M. Scheer
M. Scheer
中科院分区:
--
文献类型:
--
作者:
C. Marquardt;G. Balázs;J. Baumann;A. V. Virovets;M. Scheer

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用取代单体Ph2P-−-BH2-⋅-NMe3(1)和BuHP-−-BH2-⋅-NMe3(2)合成了由R2P-−-BH2单元组成的阳离子链化合物。通过简单的合成路线,得到了高稳定阳离子[Me3N⋅H 2B−Pr1R2−BH2⋅NMe3]+(1 a,2 a)和[Me3N⋅H2B−Pr1R2−BH2−Pr1R2−BH2⋅NMe3]+(1 b,2 b)(r1=r2=Ph;r1=H,r2=tBu)作为碘(i−)盐.H2 As−BH2⋅NMe3(3)与IBH2⋅SMe2反应生成[Me3N⋅H2B−AsH2−BH2−AsH2−BH2⋅NMe3][I](3 a),这是迄今已知的最长的arsanylborane链。化合物3 与乙腈反应生成[⋅-{As(BH2NMe3)(cME=NH)2(BH2)}][I](4)。已报道的合成策略已被证明是形成小的阳离子低聚单元的有力工具。通过X-射线结构分析、核磁共振、红外光谱、质谱学等手段,结合密度泛函理论计算,对所有产物进行了表征。
The substituted monomeric phosphanylboranes Ph2P−BH2⋅NMe3(1) andtBuHP−BH2⋅NMe3(2) have been used for the synthesis of cationic chain compounds built up by R2P−BH2units. With a simple synthesis route, the highly stable cations [Me3N⋅H2B−PR1R2−BH2⋅NMe3]+(1 a,2 a) and [Me3N⋅H2B−PR1R2−BH2−PR1R2−BH2⋅NMe3]+(1 b,2 b) (R1=R2=Ph; R1=H, R2=tBu) are obtained as iodide (I−) salts. The reaction of H2As−BH2⋅NMe3(3) with IBH2⋅SMe2leads to [Me3N⋅H2B−AsH2−BH2−AsH2−BH2⋅NMe3][I] (3 a), the longest so far known arsanylborane chain. Compound3 areacts with acetonitrile through a formal hydroarsination reaction to form [cyclo‐{As(BH2⋅NMe3)(CMe=NH)2(BH2)}][I] (4). The reported synthetic strategy has proved to be a powerful tool for the formation of small, cationic oligomeric units. All products were comprehensively characterized by X‐ray structure analysis, NMR, IR spectroscopy, and mass spectrometry in cooperation with DFT calculations.
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