Abstract Hydrochloric acid activates the oxidative iodination of aromatic compounds with the iodine-hydrogen peroxide system through the formation of an iodine (I) compound as the iodinating reagent. Activation with hydrochloric acid is more powerful than that with sulfuric acid. The formation of dichloroiodic (I) acid (HICl 2) with various forms of hydrogen peroxide was followed using UV spectroscopy. The HICl 2 was used as the iodinating reagent. In ...
