Abstract
This study focuses on the search of new applications of polyoxometalates known as decaniobate ions [Nb10O28]6−. The decaniobates can be used as basic solid catalysts in multicomponent reactions to obtain good yields to 4H-pyrans (> 95%) under microwave radiation and solvent-free conditions, using several aldehydes with different electron-withdrawing or electron donor substituents. The synthesis of (TMA)6 [Nb10O28]6H2O was performed following a simple protocol (HPNb), which was modified to decrease the number of hexaniobate species that are formed as impurities (HPNb-HF).
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Acknowledgements
We thank COLCIENCIAS for the financial support under Project No. 110965843004. EN, GPR and AGS thank to UNLP, CONICET, MYNCIT and ERANET-1.
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Gutierrez, L.F., Nope, E., Rojas, H.A. et al. New application of decaniobate salt as basic solid in the synthesis of 4H-pyrans by microwave assisted multicomponent reactions. Res Chem Intermed 44, 5559–5568 (2018). https://doi.org/10.1007/s11164-018-3440-y
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DOI: https://doi.org/10.1007/s11164-018-3440-y