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From Chlorosilyliumylidene Complexes to Cyclic Silylones with an Electron-Rich Silicon(0) Atom

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Silicon, Silylene, Silylone

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      Molecular silicon(0) species L→Si←L (L = N-heterocyclic carbenes, phosphanes, etc.), termed as silylones, have attracted significant attention. By employing the neutral bidentate bis-NHC ligand the unprecedented bis(carbene) chlorosilyliumylidene complex 1 could be isolated, in which both HOMO and LUMO are mainly localized on the silicon(II) atom according to DFT calculations./1/ Thus, dechlorination of 1 by sodium naphthalenide led to the first isolable cyclic silylone (siladicarbene) 2 featuring an electron-rich silicon(0) atom due to the weak π-acceptor character of the NHC supporting ligand.

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      Silicon, Silylene, Silylone


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