Used as a key intermediate in organic synthesis, particularly in the preparation of pharmaceuticals and agrochemicals. Its phosphonate group enables Horner-Wadsworth-Emmons olefination reactions, allowing efficient construction of carbon-carbon double bonds. This makes it valuable for synthesizing complex molecules with specific stereochemistry, especially in drug development where precise molecular architecture is critical. Also employed in the production of bioactive compounds and functional materials due to its reactivity and stability under various reaction conditions.