Used as an intermediate in the synthesis of organophosphorus compounds, particularly in the production of pesticides and flame retardants. It serves as a key reagent in the preparation of phosphorus-containing ligands for catalysis and in the development of pharmaceuticals. Its reactivity allows for the introduction of phenylphosphonate groups into larger molecules, enhancing thermal stability and modifying biological activity in agrochemicals. Also employed in research for creating novel materials with specific electronic or optical properties.