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 Wittig reactions to convert carbonyl compounds into alkenes, enhancing reaction efficiency and selectivity. Also utilized in the preparation of cinnamyl-containing organic compounds for pharmaceuticals and fine chemicals. Its phosphonium structure stabilizes carbanion intermediates, making it effective in carbon-carbon bond-forming reactions. Suitable for use in mild reaction conditions, improving yields in alkylation and olefination processes.