Facile Access to a NHC‐Coordinated Silicon Ring Compound with a Si=N Group and a Two‐Coordinate Silicon Atom

Reaction of the bicyclo[1.1.0]tetrasilatetraamide Si4{N(SiMe3)Dipp}4 1 (Dipp = 2,6‐Diisopropylphenyl) with 5 equiv. of the N‐heterocyclic carbene NHCMe4 (1,3,4,5‐tetramethyl‐imidazol‐2‐ylidene) affords a bifunctional carbene coordinated four‐membered ring compound with a Si=N group and a two‐coordinate silicon atom Si4{N(SiMe3)Dipp}2(NHCMe4)2(NDipp) 2. In a reaction of 2 with ¼ equiv sulfur (S8) two sulfur atoms add to the divalent silicon atom in plane and perpendicular to the plane of the Si4 ring which confirms the silylone‐character of the two‐coordinate silicon atom in 2.

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