Used as a phase-transfer catalyst in organic synthesis, particularly in alkylation and esterification reactions. Enhances reaction rates by facilitating the transfer of ions between aqueous and organic phases. Effective in biphasic systems due to its lipophilic cation, which improves solubility in nonpolar solvents. Also applied in the preparation of fine chemicals and pharmaceutical intermediates where selective and efficient catalysis is required. Shows stability under strong basic conditions, making it suitable for deprotonation reactions.