Used as a reagent in organic synthesis, particularly in the Wittig reaction, to form alkenes from aldehydes or ketones. It is valuable in the preparation of α,β-unsaturated esters, which are intermediates in the synthesis of pharmaceuticals, agrochemicals, and fine chemicals. Its role in creating carbon-carbon double bonds makes it essential in constructing complex organic molecules. Additionally, it is employed in the development of liquid crystals and polymers due to its ability to introduce specific functional groups into molecular structures.