Di-p-tolylphosphine is widely used as a ligand in coordination chemistry, particularly in the synthesis of transition metal complexes. These complexes are often employed as catalysts in various organic reactions, including cross-coupling reactions, hydrogenation, and hydroformylation. Its steric and electronic properties make it effective in stabilizing metal centers and enhancing catalytic activity. Additionally, it finds applications in the development of phosphine-based materials for optoelectronics and as a precursor in the synthesis of more complex organophosphorus compounds.