Used primarily as a phase transfer catalyst in organic synthesis, it facilitates the movement of reactants between immiscible phases, enhancing reaction rates and yields. It is also employed in the production of electronic components, particularly in the manufacturing of printed circuit boards, where it serves as an etchant for copper. In biochemistry, it is utilized as a reagent for protein crystallization, aiding in the study of protein structures. Additionally, it finds application in the preparation of quaternary ammonium compounds, which are widely used in surfactants, disinfectants, and fabric softeners.