W2Cl3(NMe2)3(PMe2Ph)2 and its reaction with ethyne to give (PMe2Ph)Cl2W(µ-NMe2)(µ-σ,η2–CHCH2)(µ-η2,σ-CH2NMe)WCl(NMe2)(PMe2Ph): a compound containing an azadimetallabicyclobutane core and a σ,π-vinyl ligand

Abstract

W₂Cl₃(NMe₂)₃(PMe₂Ph)₂ and ethyne (1 equiv.) react in toluene at 5 °C to give W₂Cl₃(NMe₂)₃(PMe₂Ph₂)(C₂H₂) which contains a pseudo-tetrahedral W₂(µ-C₂H₂) core supported by one Cl and one NMe₂ bridging group; in toluene at room temperature a further reaction occurs to give (PMe₂Ph)Cl₂W(µ-NMe₂)(µ-σ,η^2–CHCH₂)(µ-η²σ-CH₂NMe)-WCl(NMe₂)(PMe₂Ph) which is the first example of a compound containing a σ,±-vinyl ligand unsupported by carbonyl ligands and also the first example of an azadimetallabicyclobutane.