Used as a key reagent in organic synthesis, particularly in Horner-Wadsworth-Emmons (HWE) olefination reactions to form α,β-unsaturated esters. Its phosphonate group facilitates the formation of carbon-carbon double bonds with high selectivity and yield. Commonly employed in the synthesis of complex molecules such as natural products, pharmaceuticals, and fine chemicals where control over double bond geometry is critical. Exhibits good stability and reactivity under mild basic conditions, making it suitable for multi-step synthetic routes.