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Keywords:

  • aldehydes;
  • dehydrogenation;
  • heterocycles;
  • homogeneous catalysis;
  • hypervalent compounds
Thumbnail image of graphical abstract

A simple and efficient catalytic oxidative system for the synthesis of benzimidazole derivatives with H2O2 in the presence of catalytic amounts of Bu4NI is developed. The formation of highly reactive iodine (III) intermediate [Bu4N]+[IO2] is detected by ESI–MS for the first time, and a possible mechanism for the oxidation is proposed.