NHC-Stabilized Silicon-Carbon Mixed Cumulene

NHC-Stabilized Silicon-Carbon Mixed Cumulene
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NHC 稳定硅碳混合积聚烯

DOI:
10.1021/jacs.6b06960
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发表时间:
2016
影响因子:
15
通讯作者:
Cui Chunming
Cui Chunming
中科院分区:
化学1区
文献类型:
--
作者:
Wang Zhendong;Zhang Jianying;Li Jianfeng;Cui Chunming

文献摘要

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在甲苯中,通过Ar(SiMe 3)NK与NHC稳定的硅烯(Me 3Si)2C <$Si(SiMe 3)Cl(IPr)(2)在低温下反应,消除了2中的三甲基硅和氯基团,制备了NHC稳定的硅碳混合累积多烯(Me 3Si)2C <$Si(IPr)<$Si(IPr)<$C(SiMe 3)2(3,IPr = 1,3-二异丙基-4,5-二甲基咪唑-2-亚基)。X-射线晶体分析表明3的结构为C <$Si <$Si <$C堆积烯骨架,短的Si-Si双键距离为2.1896(10)<$. DFT计算揭示了它的两性离子特征。3与二苯乙炔反应生成了一个具有环外NHC稳定的硅烯结构的硅三富烯。
The NHC-stabilized silicon–carbon mixed cumulene (Me3Si)2CSi(IPr)Si(IPr)C(SiMe3)2(3, IPr = 1,3-diisopropyl-4,5-dimethyl-imidazol-2-ylidene) has been prepared by reaction of Ar(SiMe3)NK with the NHC-stabilized silene (Me3Si)2CSi(SiMe3)Cl(IPr) (2) in toluene at low temperature via the elimination of trimethylsilyl and chloride groups from2. X-ray crystal analysis of3indicated the formal CSiSiC cumulene skeleton with the short Si–Si double bond distance of 2.1896(10) Å. DFT calculations disclosed its zwitterionic character. Reaction of3with diphenylacetylene resulted in the formation of a silatriafulvene with an exocyclic NHC-stabilized silene moiety.