Abstract
In the present research work, two films of Chitosan-ZnO-α-Fe2O3 nanocatalyst were synthesized by sol gel method using ZnO and Fe2O3 in equimolar concentration along with chitosan. The synthesized catalysts were characterized by fourier-transform infrared spectroscopy, ultraviolet–visible spectroscopy (UV–Vis), X-ray diffraction, field emission scanning electron microscopy and energy dispersive X-ray spectroscopic methods. Morphological studies revealed spongy spherical shaped nanoparticles in both film (A and B) having nanoparticle size 25 nm and 39.5 nm. The synthesized films were employed as a catalyst for reduction of nitrothiophene acetate along with Fe/FeSO4 and the reaction completion was monitored by TLC and UV–Visible spectral analysis. The reduction yield was 79% and 88% respectively for both the film A and film B. Further, the cyclization of formed aminothiophene with trimethylaluminum lead to the formation of dihydrotheinopyrrolone, which was confirmed by liquid chromatography with mass spectral detector and proton nuclear magnetic resonance (1H-NMR) spectroscopic characterization techniques. Thus, the result indicates that the synthesized Chitosan-ZnO-α-Fe2O3 nanocatalysts are efficient over other traditional catalysts for effective reduction of nitro group.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
Authors are thankful to M. S. Ramaiah University of Applied Sciences, Bangalore for providing basic facilities. Authors also acknowledge their thankfulness to Centre for Nano and Soft Materials, Bangalore, Ramaiah Institute of Technology, Bangalore and University of Mysore for providing the characterization facilities.
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Dr. SB has designed the work and contributed in writing the manuscript. Mrs. MMP has carried the synthesis of compounds, catalysts and characterization of compounds. Dr. BCY has contributed for the characterization of the nanocatalyst. Dr. PK involved in manuscript preparation.
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Pai, M.M., Yallur, B.C., Batakurki, S. et al. Facile Synthesis of Chitosan-ZnO-α-Fe2O3 as Hybrid Nanocatalyst and Their Application in Nitrothiopheneacetate Reduction and Cyclization of Aminothiopheneacetate. Top Catal (2022). https://doi.org/10.1007/s11244-021-01544-8
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DOI: https://doi.org/10.1007/s11244-021-01544-8