Used as a phase-transfer catalyst in organic synthesis, particularly in alkylation and acylation reactions. It facilitates the transfer of ions between aqueous and organic phases, enhancing reaction rates and selectivity. Also employed in the preparation of fine chemicals and pharmaceutical intermediates due to its stability under various reaction conditions. Its ionic structure makes it suitable for promoting reactions in nonpolar solvents where traditional catalysts may not dissolve. Additionally, it has been utilized in electrochemical applications as a supporting electrolyte.