Triethylmethylammonium chloride is a quaternary ammonium salt, classified as an alkylammonium salt. This compound is widely used as a phase-transfer catalyst in organic synthesis, facilitating the transfer of reactants between immiscible phases. Additionally, it serves as an electrolyte in electrochemical devices, a surfactant in emulsion polymerization, and a corrosion inhibitor. Its unique chemical properties make it an essential component in various industrial applications, including pharmaceuticals, agrochemicals, and materials science.