Used as a phase-transfer catalyst in organic synthesis, facilitating reactions between reagents in different phases by transferring ions into organic solvents. Commonly applied in nucleophilic substitution and oxidation reactions. Also serves as a precursor for ylide formation in Wittig reactions, enabling the conversion of carbonyl compounds to alkenes. Its quaternary phosphonium structure enhances thermal stability and solubility in nonpolar media, making it suitable for high-temperature catalytic processes.