Abstract
The feasible and one of the green ways to synthesize organic compounds especially pyrazole and its derivatives are systematically presented. The one-pot synthesis of pyrazole was achieved by condensation of various hydrazines and 1,3-diketone derivatives at room temperature using transition metal-based ionic liquids. Herein, the unique combination of Fe(III) with ionic liquid is explored and utilized as an efficient homogeneous catalyst for the synthesis of pyrazole and its derivatives. The homogenous catalyst thus synthesised was re-used up to the fourth cycle (with 90%, 88%, 84%, 78% yields respectively).
Graphic abstract
Pyrazoles are synthesized in the presence of transition metal-based ionic liquids at room temperature. From the green chemistry perspective, ionic liquids are considered as green solvents which have gained remarkable attention because of its non-toxic, non-corrosive and non-flammable nature while the presence of transition metal as a part of counter anion gives it more catalytic activity.
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Acknowledgements
M. K. is thankful to UGC for UGC-BSR fellowship. D. S. is thankful to DST, New Delhi, India for a research grant [No. EMR/2016/002345]. The authors also acknowledge the Department of Science and Technology for financial assistance under DST-FIST programme and UGC, New Delhi for Special Assistance Programme (UGC-SAP) to the Department of Chemistry, Dibrugarh University.
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Konwar, M., Elnagdy, H.M.F., Gehlot, P.S. et al. Transition metal containing ionic liquid-assisted one-pot synthesis of pyrazoles at room temperature. J Chem Sci 131, 80 (2019). https://doi.org/10.1007/s12039-019-1659-9
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DOI: https://doi.org/10.1007/s12039-019-1659-9