Widely used as a phase-transfer catalyst in organic synthesis, facilitating reactions between substances in different phases, such as aqueous and organic layers. It is particularly effective in nucleophilic substitution reactions, where it enhances the transfer of anions into the organic phase. Additionally, it serves as an electrolyte in electrochemical applications, including batteries and supercapacitors, due to its ionic conductivity and stability. In analytical chemistry, it is employed as an ion-pairing agent in chromatography to improve the separation of ionic compounds. Its role in the synthesis of pharmaceuticals and fine chemicals is also notable, where it aids in the formation of complex molecules.