Tri(p-tolyl)phosphine is widely used as a ligand in catalytic processes, particularly in transition metal-catalyzed reactions. It plays a crucial role in facilitating cross-coupling reactions, such as Suzuki-Miyaura and Heck reactions, which are essential in the synthesis of pharmaceuticals, agrochemicals, and fine chemicals. Its steric and electronic properties make it effective in stabilizing metal complexes, enhancing reaction efficiency and selectivity. Additionally, it is employed in the production of organic light-emitting diodes (OLEDs) and other advanced materials, where it assists in the formation of phosphorescent complexes. Its application extends to polymer chemistry, where it acts as a catalyst or co-catalyst in polymerization processes.