Used as a key intermediate in the synthesis of pharmaceuticals, agrochemicals, and ligands for transition metal catalysis, particularly in palladium-catalyzed cross-coupling reactions to functionalize the aryl ring. The phosphine oxide moiety provides stability and serves as a versatile functional group for further synthetic transformations, such as reduction to the corresponding phosphine. Commonly employed in the development of bioactive compounds and functional materials due to its favorable reactivity and stability profile.