Used as an intermediate in the synthesis of pharmaceuticals and biologically active compounds, particularly in the development of kinase inhibitors and antiviral agents. Its phosphonate group enables it to mimic phosphate esters in metabolic pathways, making it valuable in prodrug design. Also employed in agrochemical research for creating novel pesticides due to its reactivity and ability to penetrate biological membranes. Commonly utilized in Horner-Wadsworth-Emmons reactions to form carbon-carbon bonds, especially in constructing α,β-unsaturated carbonyl systems found in natural products and medicinal agents.