Used as an intermediate in the synthesis of organophosphorus compounds, particularly in the production of pesticides and flame retardants. It serves as a phosphorylating agent in organic reactions, enabling the introduction of phosphate groups into various substrates. Its reactivity makes it valuable in the development of chemical warfare agent simulants for research and detection method validation. Also employed in the preparation of specialty polymers and ligands for catalysis. Due to high reactivity with moisture, it is handled under anhydrous conditions in controlled environments.