Stable? You can bottle it! The base‐stabilized dichlorosilylene L1SiCl2 (see picture; L1=1,3‐bis(2,6‐diisopropylphenyl)imidazol‐2‐ylidene) is stable at room temperature. L1SiCl2 can undergo a reaction with diphenylacetylene to form a trisilacyclopentene derivative. These compounds have been characterized by X‐ray crystallography and computational studies.

Stabil? Man kann es abfüllen! Das basenstabilisierte Dichlorsilylen L1SiCl2 (siehe Bild; L1=1,3‐Bis(2,6‐diisopropylphenyl)imidazol‐2‐yliden) ist bei Raumtemperatur stabil und reagiert mit Diphenylacetylen zu einem Trisilacyclopentenderivat. Beide Verbindungen wurden röntgenographisch und mithilfe von Computerstudien charakterisiert.

The first structurally described cobalt(I) Lewis-base-stabilized silylene complex [Co(CO)(3){SiCl(2)(IPr)}(2)](+)[CoCl(3)(THF)](-) [1; IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene] was prepared by applying the two-electron sigma-donor ligand SiCl(2)(IPr) through coordination with Co(2)(CO)(8). The bonding situation between ligand SiCl(2)(IPr) and the cobalt(I) metal center in [Co(CO)(3){SiCl(2)(IPr)}(2)](+) of 1 was investigated by (1)H NMR and IR spectroscopy, single-crystal X-ray structural analysis, and density functional theoretical calculations.

Reactions of silicon halides with N-heterocyclic carbene produce neutral penta-or hexacoordinate complexes IPr 3 SiF 4 (1), IPr 3 SiF 4 3 IPr (2), and IPr 3 SiBr 4 (3) (IPr=:C[N(2,6-iPr 2 -C 6 H 3 )-CH] 2 ). Molecular structures of 1-3 were determined by X-ray diffraction studies and exhibit interesting structural features.

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