Donor‐Stabilized Silylene/Phosphine‐Supported Carbon(0) Center with High Electron Density

Abstract

An isolable donor-stabilized silavinylidene phosphorane was synthesized. This molecule,w hich can also be regarded as an ew carbon(0) complex featuring ap hosphine and ad onor-stabilized silylene ligand, presents ac entral carbon atom with ar emarkably high electron density (À1.82). Furthermore,t he experimental electron-density study of this compound demonstrates the delocalization of the s-lone pair at the central carbon atom towardt he silicon center,afeature which is remarkably different from electronic situation of other bent-allene-type molecules.This result clearly demonstrates the powerful electron-donating ability of donorstabilized silylene ligands,a sw ell as their excellent electronacceptor properties.

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

“…The resonance structure 2′′ represents a silicon(0) center stabilized by two donor‐coordinated silylene ligands. Until now, only a compound with a carbon(0) center supported by only one donor‐stabilized silylene ligand and a phosphine ligand is known …”

Complexes of Dichlorogermylene with Phosphine/Sulfoxide-Supported Carbone as Ligand

“…It was only in 2006, after the theoretical investigations by Frenking et al [ 9 , 10 , 11 , 12 ], that these molecules were considered as a carbon atom in the zero-oxidation state stabilized by two L-phosphine ligands, in agreement with the description initially used by Kaska in 1973 [ 13 ]. Since then, this family of ligands has considerably grown, leading to a large structural diversity of carbones II and a better understanding of their behavior [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. Naturally, owing to the existence of two lone pairs, they are strong σ- and π-donors (two- or four-electron donating ability); they have been used as original ligands for the preparation of organometallic complexes with interesting applications in catalysis [ 24 , 25 , 26 , 27 , 28 , 29 ].…”