Used as a ligand in transition metal-catalyzed reactions, particularly in palladium-catalyzed cross-coupling reactions such as Suzuki-Miyaura and Heck reactions. Its phosphine group coordinates effectively with metals, enhancing catalyst stability and activity. The carboxylic acid functionality allows for easy modification or anchoring to supports, enabling use in heterogeneous catalysis. Also employed in the synthesis of functional materials and in pharmaceutical intermediates where selective catalysis is required.