hydrogenchloride; aluminium trichloride; boron trichloride 1.) C6H6, CH2Cl2, reflux, 3 h, 2.) C6H6, CH2Cl2, 80 deg C, 45 min; Multistep reaction;

sodium tetrahydroborate in 1,4-dioxane; water 1 h; Heating; Yield given;