Used as a phase-transfer catalyst in organic synthesis, facilitating reactions between reagents in different phases by shuttling ions into organic solvents. Commonly applied in alkylation, oxidation, and polymerization processes where efficient anion activation is required. Also serves as a precursor for preparing phosphorus-based ligands in catalytic systems, enhancing reaction rates and selectivity under mild conditions. Its bifunctional quaternary phosphonium structure enables cooperative effects in dual activation mechanisms.