Synthesis And Characterization Of A Crown-Shaped 36-Molybdate Cluster And Application In Catalyzing Knoevenagel Condensation
INORGANIC CHEMISTRY(2020)
Abstract
A novel crown-shaped 36-molybdate cluster with organophosphonate-functionalized polyoxomolybdates, (NH4)(17)Na7H12[Co(H2O)TeMo6O21{N(CH2PO3)(3)}](6)center dot 42H(2)O, has been successfully synthesized and well-characterized. It owns the highest nuclearity in the family of organophosphonate-based polyoxometalates reported so far. Furthermore, for the first time in the field, we illustrated that polyoxomolybdate could work as an effective heterogeneous catalyst for the Knoevenagel condensation reaction with high TOF (7714 h(-1)) and good recyclability. Impressively, the catalytic performance of 1 was also tested successfully in a large scale (similar to 10 g) reaction, where 89% of reaction yield and 3216 of TON were afforded.
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Key words
catalyzing knoevenagel condensation,crown-shaped
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