ja6b06960_si_003.cif (5.23 MB)

NHC-Stabilized Silicon–Carbon Mixed Cumulene

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posted on 11.08.2016, 00:00 by Zhendong Wang, Jianying Zhang, Jianfeng Li, Chunming Cui
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 from 2. X-ray crystal analysis of 3 indicated 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 of 3 with diphenylacetylene resulted in the formation of a silatriafulvene with an exocyclic NHC-stabilized silene moiety.