TBAT (Tetrabutylammonium Tetraphenylborate) is widely used as a phase-transfer catalyst in organic synthesis, facilitating the transfer of reactants between immiscible phases, such as aqueous and organic layers. It is particularly effective in reactions like nucleophilic substitutions, where it enhances the reactivity of anions in organic solvents. Additionally, TBAT is employed in electrochemical applications, serving as a supporting electrolyte in non-aqueous systems due to its high solubility and stability. It is also utilized in the preparation of ion-selective electrodes, where it acts as a lipophilic salt to improve sensor performance. In polymer chemistry, TBAT is used to control polymerization processes and modify material properties. Its versatility makes it a valuable reagent in both research and industrial settings.