Used as a reagent in organic synthesis, particularly in the Wittig reaction to produce alkenes from aldehydes and ketones. It serves as a precursor for generating phosphonium ylides, which are key intermediates in forming carbon-carbon double bonds. Applied in the synthesis of fine chemicals, pharmaceuticals, and natural products. Also utilized in the preparation of functionalized polymers and materials with specific properties. Its role in modifying biomolecules and creating novel compounds makes it valuable in research and industrial chemistry.