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- W3048185399 abstract "Polyoxometalates (POMs) have been applied as catalysts because their chemical properties can be tuned via cluster structure design. The negativity of the surface O atoms of POMs is believed to be an important chemical property for base catalytic applications. Moreover, pentavalent metals (M5+) such as group 5 elements (V, Nb, Ta) are the most promising constituent metals for POMs as base catalysts according to the trade-off between the basicity and the stability of the clusters. In this chapter, the possibility of using group 5 POMs for base catalytic applications is demonstrated theoretically and experimentally. Density functional theory calculations of various POMs were conducted to evaluate the basicity of the surface O atoms. Based on these theoretical predictions, [Nb10O28]6− was chosen as a representative group 5 POM and was applied as homogeneous catalyst for aldol-type condensation reactions such as the Knoevenagel and Claisen–Schmidt condensation reactions. [Nb10O28]6− was found to act as a Bronsted base catalyst whose strength is comparable to that of superbases. This result opens up the possibility of applying group 5 POMs as base catalysts." @default.
- W3048185399 created "2020-08-13" @default.
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- W3048185399 date "2020-01-01" @default.
- W3048185399 modified "2023-10-02" @default.
- W3048185399 title "Brønsted Base Catalysis of [Nb10O28]6−" @default.
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- W3048185399 doi "https://doi.org/10.1007/978-981-15-7348-4_2" @default.
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