Used as a key intermediate in the synthesis of pharmaceuticals, particularly in the development of kinase inhibitors for targeted cancer therapies. Its phosphine oxide group enables coordination in catalytic reactions, making it valuable in transition metal-catalyzed cross-coupling processes. Also employed in agrochemical research for designing bioactive molecules with enhanced stability and selectivity. The carboxylic acid functionality allows for easy derivatization, facilitating the creation of amide or ester analogs in structure-activity relationship studies.