Interaction of Fischer carbene complexes of the type W(CO)5[C(OMe)R] (R = CH3, C2H5) with acetylenes

Article abstract of DOI:10.1021/om00088a024

W(CO)₅[C(OMe)CH₂R¹] (R¹ = H, CH₃) reacts with PhC₂R² (R² = Ph, CH₃) in toluene at 100°C to give vinyl ethers and enones. The formation of these products can be explained by an exocyclic β-hydride elimination reaction of a metallacyclobutene intermediate.