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 enables the construction of carbon-carbon double bonds with high selectivity and yield. Commonly employed in the synthesis of complex molecules such as pharmaceuticals, agrochemicals, and natural products. The benzyl group acts as a protecting group for the carboxylic ester, which can be easily removed via hydrogenolysis when needed. Its stability and reactivity make it valuable in multi-step synthetic routes.