“…Various oxidative agents such as 1,4-benzoquinone (18), MnO 2 (19), H 2 O 2 /HCl (20), benzofuroxane (21), 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) (22), ceric (IV) ammonium nitrate (CAN) (23), NaHSO 3 (24), and polymer-supported hypervalent iodine (25) have been applied. On the other hand, it has been reported that the redox system can be used as the catalyst for the preparation of benzimidazoles.…”