Journal
RSC ADVANCES
Volume 6, Issue 10, Pages 8164-8172Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra19066e
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Funding
- University Grants Commission of India
- Department of Science and Technology (DST), India
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We report the synthesis of benzothiazoles and benzimidazoles using graphene oxide as an effective catalyst with good yields and easy recyclability. Graphene oxide plays the dual role of a metal-free acid catalyst and an oxidizing agent. The mechanism of action of graphene oxide as a catalyst was confirmed using X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy and transmission electron microscopy. Good yields were obtained at 60 degrees C as well as under ultrasonic irradiation at 35 degrees C with methanol as the solvent. Additionally, this is also the first report in which the regeneration of partially-reduced spent graphene oxide has been carried out to restore the oxygen containing functional groups and provide a path for the reuse of graphene oxide as the catalyst and oxidizing agent.
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