Tetrabutylammonium trichloride (TBA Cl_3) was prepared by bubbling chorine gas into a solution of tetrabutylammonium chloride in CH_2Cl_2. The reaction of such aromatic compounds as phenol, aniline, anisole, acetanilides, arenes, acetophenone, and styrene, with TEA Cl_3 in appropriate solvent at room temperature gave the corresponding chloro-substituted compounds, respectively.