Used as a highly efficient catalyst in cross-coupling reactions, particularly in carbon–carbon bond formation processes such as Kumada and Negishi couplings. Its stability and electron-rich ligand environment enhance catalytic activity, allowing reactions to proceed under mild conditions with high yields. The bulky mesityl and di-tert-butyl fumarate groups help prevent catalyst deactivation, making it suitable for transformations involving sterically demanding substrates. It is also employed in the synthesis of complex organic molecules, including pharmaceuticals and functional materials, where precise control over reactivity and selectivity is required.