Palladium-catalyzed transfer hydrogenation of terminal alkynes using ethanol as the hydrogen donor

A ligand-promoted, palladium-catalyzed transfer hydrogenation of terminal alkynes using ethanol as the hydrogen donor is developed. The chemical selectivity control achieved based on ligand regulation. use triethanolamine and tetrahydrofuran at 80 °C under N 2 found to be critical for alkynes. general applicability this procedure highlighted by synthesis 27 alkenes in moderate good yields.