Using Triethynylphosphine Ligands Bearing Bulky End Caps To Create a Holey Catalytic Environment: Application to Gold(I)-Catalyzed Alkyne Cyclizations

摘要

Triethynylphosphines are an interesting class of compounds that can be used as phosphorus ligands in transition metal complexes.Owing to the linearity of the sp-hybridized carbon atoms,triethynylphosphines possess a rigid tripodal framework with the minimum steric demand around the phosphorus center.The entire structure can be varied through the substituents at the alkyne termini without affecting the steric environment in proximity to the phosphorus center.Despite these intriguing characteristics,however,no catalytic application of triethynylphosphines has been reported.