Ni-rGO-zeolite nanocomposite : an efficient heterogeneous catalyst for one-pot synthesis of triazoles in water
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An important group of pharmaceutical materials, 1,2,3-triazoles, has been synthesised using a Ni-based nanocomposite catalyst (Ni-rGO-zeolite) through azide alkyne cycloaddition (NiAAC). First, a GO-zeolite hybrid was prepared through protonation of a Na-Y-zeolite by H+ ions originating from the -COOH groups of GO. Subsequently the GO-zeolite was treated with Ni-acetate solvothermally in the presence of NaBH4 (reducing atmosphere). Under the solvothermal conditions a significant part of the incorporated Ni ions in the GO-zeolite were reduced to Ni(0) and simultaneously GO was transformed into rGO. The resulting ternary nanocomposite, Ni-rGO-zeolite, serves as a highly efficient heterogeneous catalyst, and shows excellent regioselectivity forming 1,4-disubstituted-1,2,3-triazoles as the sole product at a low loading of the nickel (similar to 2.6 mol% with respect to the substrate) with recyclability, and without any significant leaching of the metal. In addition, the Ni-rGO-zeolite exhibits enhanced efficiency under aqueous conditions, proficiency with varying substrates and overcomes some of the shortcomings of the previously reported limited number of Ni-based and other catalysts. The catalytic process is believed to involve the active Ni(0) species, which is stabilized by electron rich rGO that is supported on the microporous high-surface-area zeolite.
Choudhury , P , Chattopadhyay , S , De , G & Basu , B 2021 , ' Ni-rGO-zeolite nanocomposite : an efficient heterogeneous catalyst for one-pot synthesis of triazoles in water ' , Materials Advances , vol. Advance Article . https://doi.org/10.1039/d1ma00143d
Copyright © 2021 The Author(s). Published by the Royal Society of Chemistry. article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.
DescriptionFinancial support from SERB, New Delhi is gratefully acknowledged (Grant No EMR/2015/000549). PC and SC thanks UGC, New Delhi, for Senior Research Fellowship under UGC-NET.
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