Generally, iodoarenes are prepared under acidic conditions such as iodination of reactants conducted in the presence of H 2 SO 4 , [ 3 3. (a) Chaikovskii , VK ; Funk , AA ; Filimonov , VD ; Petrenko , TV ; Kets , TS Facile iodination of aromatic compounds having electron-withdrawing substituents. Generation of triiodine cation in the system tetra-N-iodoglycoluril-iodine-sulfuric acid . Russ. J. Org. Chem. 2008 , 44 , 935 – 936 ; (b) Kraszkiewicz , L. ; Sosnowski , M. ; ...