Abstract
Twelve N-(3- and 4-substituted phenyl)-O-isobutyl thionocarbamates, eight of which are novel, were synthesized from O-isobutyl xanthate and 3- and 4-substituted anilines in the presence of a nano-platinum aminophenyl modified multi-walled carbon nanotube catalyst. The nano-Pt catalyst was prepared on a carbon nanotube support modified by diazotization, nitro group reduction, and subsequent microwave-assisted nano-Pt precipitation. The catalyst was characterized by Fourier transform infrared (FT-IR) spectroscopy, elemental analysis, thermogravimetric analysis, and transmission electron microscopy. The nano-platinum/modified carbon nanotube catalyst was compared with a commercial Pt/active carbon catalyst in terms of product purity and yield. The results obtained by the use of the catalysts were additionally compared with those obtained by reaction of sodium isobutyl xanthogenacetate and 3- and 4-substituted anilines. Full structure characterization of the synthesized N-(substituted phenyl)-O-isobutyl thionocarbamates was achieved using FT-IR, 1H and 13C NMR, and mass spectrometric methods, and their purity was proved by elemental analysis and gas chromatography. The new catalytic method offers advantages over the commercial method, such as higher yields and no product purification is required, thus conforming to the principles of ecologically friendly syntheses.
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Acknowledgments
This work was supported by the Ministry of Education and Science of the Republic of Serbia (Project Number 172013 and III45019). Goran Vuković is grateful to the project FP7 REGPOT NANOTECH FTM, GRANT AGREEMENT 245916 for financial support. The authors gratefully thank Professor Velimir Radmilović from the National Centre for Electron Microscopy, Lawrence Berkeley National Laboratory, for the electron microscopy characterization. Electron microscopy characterization was supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Contract No. DE-AC02 05CH11231.
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Milosavljević, M.M., Vuković, G.D., Marinković, A.D. et al. Synthesis of N-(3- and 4-substituted phenyl)-O-isobutyl thionocarbamates from O-isobutyl xanthate and amines using a nano-platinum multi-walled carbon nanotube catalyst. Monatsh Chem 142, 1045–1053 (2011). https://doi.org/10.1007/s00706-011-0568-5
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DOI: https://doi.org/10.1007/s00706-011-0568-5