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New Journal of Chemistry
Page 8 of 10
ARTICLE
Journal Name
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apparatus (Sunder industrial products, Mumbai) and are 10
uncorrected. Nuclear magnetic resonance spectra were recorded on
Agilent (300 MHz or 400 MHz, 500MHz) instrument with DMSO-d6 or
McLaughlin, J. Mustakis, K. W. HetDteOnIb: 1a0c.h10, 3J9. /MC9.NHJa0w52k8in3Fs
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CDCl3 as a solvent and TMS as an internal standard.
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Experimental Section
Preparation of Graphene oxide (GO) by reported improved
Hummer`s method (IHM)35:
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Graphene oxide was synthesized from natural graphite flakes by
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following Improved Hummer’s method.35
General Procedure for Direct Catalytic Amidation of Esters:
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Ester (1.0 mmol) and aliphatic/aromatic amine (1.2 mmol) were
heated at 80-120°C along with graphene oxide (20 wt. %) in 25mL of
a sealed tube for the required time. After the reaction gets
completed, the reaction mass was cooled to RT and then dissolved in
ethyl acetate (10 mL). The GO was separated from the reaction mass
by simple filtration. Most of the pure products were obtained directly
after solvent evaporation under vacuum. In some cases, the crude
reaction mass was subjected to column chromatography (solvent
system- Hexane: Ethyl acetate) to get pure product.
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Acknowledgments
Authors are greatly thankful to University Grants commission-
UGC-CAS and Green Technology for providing financial
assistance, SAIF IIT, Bombay for performing TEM analysis, and
MRC, MNITJ Jaipur for Raman analysis. D D pal, TS XRD and XPS
lab, IIT Kanpur for XPS analysis.
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Conflict of interest
There are no conflicts to declare.
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Notes and references:
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