Diphenyl(p-tolyl)phosphine is widely used as a ligand in coordination chemistry, particularly in the synthesis of transition metal complexes. These complexes are essential in various catalytic processes, including hydrogenation, hydroformylation, and cross-coupling reactions, which are crucial in the production of pharmaceuticals, fine chemicals, and polymers. Its role as a ligand enhances the stability and reactivity of metal catalysts, making it valuable in organic synthesis. Additionally, it is employed in the development of advanced materials, such as phosphorescent compounds for organic light-emitting diodes (OLEDs), where it contributes to efficient electron transport and light emission. Its application in research and industrial processes underscores its importance in modern chemistry.