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 alkylation, oxidation, and esterification processes where efficient ion transport enhances reaction rates and yields. Also utilized in the preparation of quaternary ammonium compounds for surfactant and antimicrobial agent development. Its structural rigidity from the diphenyl groups can improve selectivity in certain catalytic reactions.