Tetrabutylammonium dichlorobromide is an organic compound comprising ammonium ions, chloride ions, and bromide ions. It is primarily used as a phase-transfer catalyst in organic synthesis, particularly in the production of pharmaceuticals and agrochemicals. Tetrabutylammonium dichlorobromide has strong basic properties, facilitating the transfer of reactants between immiscible solvents to enable more efficient chemical reactions. Additionally, it serves as an intermediate in synthesizing other quaternary ammonium compounds.