Cationic Stannylenes: In Situ Generation and NMR Spectroscopic Characterization.

Cationic Stannylenes: In Situ Generation and NMR Spectroscopic Characterization.
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阳离子亚锡:原位生成和 NMR 光谱表征

DOI:
10.1021/acs.inorgchem.6b02377
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发表时间:
2017
影响因子:
4.6
通讯作者:
L. Wesemann
L. Wesemann
中科院分区:
化学2区
文献类型:
--
作者:
C. P. Sindlinger;F. S. W. Aicher;L. Wesemann

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MeNHC的反应(MeNHC = 1,3,4,5-四甲基咪唑亚基,其中NHC = N-杂环卡宾)与有机锡(II)的加合物:Ar*SnH和Ar′SnH [Ar* = 2,6-Trip 2C 6 H3,其中Trip = 2,4,6-三异丙基苯基; Ar′ = 2,6-Mes 2 C6 H3,其中Mes = 2,4,6-三甲基苯基)]与刘易斯酸如B(C6 F5)3或[CPh 3]+的反应允许提取氢化物并因此产生阳离子,二配位双(σ-C)-取代的亚锡烷基[ArSn(NHC)]+。这种阳离子stannylene的假定二配位的构成进行了研究,通过NMR光谱和密度泛函理论计算进一步支持。对于Ar′SnH(MeNHC),发现生成的阳离子没有充分的空间位阻,从而允许形成加合物[Ar′(NHC)Sn-Sn(H)(NHC)Ar′]+,其可以被描述为质子化的双(NHC)加合物到1,2-二锡炔的形式。
The reaction ofMeNHC (MeNHC = 1,3,4,5-tetramethylimidazolylidene, where NHC = N-heterocyclic carbene) adducts to organotin(II) hydrides Ar*SnH and Ar′SnH [Ar* = 2,6-Trip2C6H3, where Trip = 2,4,6-triisopropylphenyl; Ar′ = 2,6-Mes2C6H3, where Mes = 2,4,6-trimethylphenyl)] with Lewis acids such as B(C6F5)3or [CPh3]+allows the abstraction of hydride and thus the generation of cationic, dicoordinate bis(σ-C)-substituted stannylenes [ArSn(NHC)]+. The supposedly dicoordinate constitution of this cationic stannylene was investigated by NMR spectroscopy and further supported by density functional theory computations. For Ar′SnH(MeNHC), the generated cation was found to be inadequately sterically encumbered, allowing the formation of an adduct, [Ar′(NHC)Sn–Sn(H)(NHC)Ar′]+, which can be described as the protonated bis(NHC) adduct to the formal 1,2-distannyne.
通过双重配体从 NHC 加合物转移到有机锡 (II) 氢化物形成二聚铂-亚锡络合物。
DOI: --
发表时间: 2015
影响因子: 4.9
作者:
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