Synthesis of mixed halogenated dibenzodioxins (X=Br, Cl)

The conversion of dibenzodioxin with CuCl2×2H2O and CuBr2 results in polyhalogenated dibenzodioxins. Besides the chlorinated compounds, bromination stages 1 to 5 are obtained at chlorination levels of 0 to 7 for monobromo-, 0 to 7 for dibromo-, 0 to 4 for tribromo-, 0 to 3 for tetrabromo-, and 0 to 1 for pentabromodibenzodioxin. The 2,3,7,8 position is halogenated preferentially.