Tri(m-tolyl)phosphine is widely used as a ligand in various 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 and organic compounds. Its steric and electronic properties make it effective in stabilizing metal complexes, enhancing catalytic efficiency. Additionally, it is employed in the production of polymers and materials science, where it aids in controlling polymerization processes. Its application extends to organic synthesis, where it acts as a reducing agent or a stabilizing agent in complex chemical transformations.