An efficient and one-pot green synthesis of 2-arylsubstituted benzimidazoles catalyzed by nano-Fe3O4@silica sulfuric acid as a recyclable nanomagnetic solid acid catalyst

Authors

  • Manizhe Ayazi Department of Chemistry, Payame Noor University, PB BOX 19395-3697, Tehran, Iran
  • Sayed Hossein Banitaba Department of Chemistry, Payame Noor University, 19395-4697, Tehran, Iran Research Center of Environmental Chemistry, Payame Noor University, Ardakan, Yazd, Iran
Abstract:

An efficient and green protocol for the synthesis of 2-arylsubstituted benzimidazoles via a condensation reaction of aromatic aldehydes and 1,2-phenylenediamine using nano-Fe3O4@SiO2-SO3H as a solid acid catalyst in ethanol under reflux conditions has been described. The reactions are completed in short times, and the corresponding benzimidazoles are produced with high yields. The present procedure has several advantages, including short reaction times, high yields of products, facile experiment, simple work-up, eco-friendly reaction conditions, and reusability of the catalyst. The catalyst could simply be separated and recovered by an external magnet and reused several times without appreciable loss of catalytic activity.

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Journal title

volume 8  issue 1

pages  80- 91

publication date 2020-01-01

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