Ethyldiphenylphosphine is widely used as a ligand in coordination chemistry, particularly in the synthesis of transition metal complexes. These complexes are essential in catalytic processes, such as hydrogenation, hydroformylation, and cross-coupling reactions, which are crucial in the production of pharmaceuticals, fine chemicals, and polymers. Its ability to stabilize metal centers and modulate reactivity makes it valuable in asymmetric catalysis, enabling the production of chiral compounds with high enantioselectivity. Additionally, it finds applications in organic synthesis as a reagent for forming carbon-phosphorus bonds, contributing to the development of organophosphorus compounds used in agrochemicals and flame retardants. Its role in material science includes the preparation of phosphine-based polymers and coatings with specialized properties.