Used as a key ligand in transition metal catalysis, particularly in palladium-catalyzed cross-coupling reactions such as Suzuki and Heck reactions. Its electron-donating properties enhance catalyst stability and reactivity. Also employed in the synthesis of phosphine-based ligands and organophosphorus compounds for pharmaceuticals and agrochemicals. Serves as a reducing agent in certain organic transformations and participates in radical reactions due to the weak P–H bond. Commonly applied in materials science for preparing metal-organic frameworks and functional polymers.