Abstract
Graphene oxide nanosheets were synthesized from natural graphite powder. The prepared catalyst was characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, powder X-ray diffraction, thermogravimetric analysis and ultraviolet–visible spectroscopy. This heterogeneous catalyst was used for the Friedel–Crafts 3-indolylation reaction of isatin with indole derivatives in water as a green media in good to excellent yields. This method has advantages including the use of water as a green solvent, short reaction time, easy workup and excellent yields.
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The authors are grateful to the University of Birjand for financial support.
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Allahresani, A., Nasseri, M.A., Akbari, A. et al. Graphene oxide based solid acid as an efficient and reusable nano-catalyst for the green synthesis of diindolyl-oxindole derivatives in aqueous media. Reac Kinet Mech Cat 116, 249–259 (2015). https://doi.org/10.1007/s11144-015-0883-7
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DOI: https://doi.org/10.1007/s11144-015-0883-7