Tetrabutylammonium bromide (TBAB) ua raws li theem hloov pauv catalyst los ntawm kev yooj yim hloov cov reactants ntawm ntau theem, txhim kho cov tshuaj tiv thaiv. Nws pab solubilize organic halides nyob rau hauv aqueous theem, ua rau lawv hnov mob nrog nucleophiles.