Used as a key reagent in organic synthesis, particularly in Horner-Wadsworth-Emmons (HWE) olefination reactions to construct carbon-carbon double bonds. It enables the selective formation of α,β-unsaturated esters, ketones, and aldehydes when reacted with carbonyl compounds. Its sulfonyl group enhances the acidity of the α-protons, improving reactivity and yield. Commonly employed in the synthesis of pharmaceuticals, agrochemicals, and fine chemicals where precise alkene geometry is required. Also utilized in the preparation of bioactive molecules and conjugated systems due to its stability and ease of handling.