Influence of Bis-NHC Ligand on Platinum-Catalyzed Hydrosilylation of Internal Alkynes

Synthesis and characterization of a new bifunctional N-heterocyclic carbene precursor with sterically expanded substituents is described. The obtained NHC is employed in the catalytic system for hydrosilylation of internal alkynes providing a fully selective and effective process in mild conditions under air. Comparison of the performance of the newly developed catalytic system with its analogs based on monofunctional NHC ligands proves that the presence of two metal atoms and the proper design of the steric environment around the metal center ensure a definitely greater activity in the hydrosilylation process.

Automated summary

This study describes the synthesis and characterization of a new bifunctional N-heterocyclic carbene precursor with sterically expanded substituents. The obtained NHC is used in the catalytic system for hydrosilylation of internal alkynes, providing a fully selective and efficient reaction under mild conditions in the presence of air. Comparative analysis with analogs based on monofunctional NHC ligands demonstrates that the presence of two metal atoms and the proper design of the steric environment around the metal center significantly enhance the catalytic activity in the hydrosilylation process.