Used primarily in organic synthesis as a Wittig reagent, it converts aldehydes and ketones into alkenes by forming a carbon-carbon double bond. This reaction is highly valuable for constructing olefinic frameworks in complex molecules, including natural products and pharmaceuticals. It is especially effective for generating terminal alkenes from carbonyl compounds. The reagent is reactive toward a wide range of aldehydes and ketones, making it a versatile tool in synthetic chemistry. Its application is common in research laboratories for carbon-chain elongation and functional group transformation.