Used primarily in the synthesis of chemical warfare agents, particularly nerve agents, due to its ability to form highly toxic organophosphate compounds. It serves as a key intermediate in the production of substances that inhibit acetylcholinesterase, leading to severe neurological effects. In controlled research settings, it is utilized for studying the mechanisms of organophosphate toxicity and developing antidotes or protective measures. Its handling is strictly regulated due to its hazardous nature and potential misuse.