Widely used in organic synthesis as a Wittig reagent, enabling the formation of carbon-carbon double bonds through olefination reactions. It is particularly effective for converting aldehydes into α,β-unsaturated esters, which are key intermediates in the synthesis of complex molecules such as natural products, pharmaceuticals, and fine chemicals. Its stabilized ylide character allows for high selectivity and yield in reactions, making it valuable in both academic research and industrial applications. The resulting ester functionality can be further modified, offering versatility in multi-step synthetic pathways.