Several urea-inserted organo-polyoxometalates (POMs) derived from polyoxotungstovanadate [P2V3W15O61]9− were prepared. The insertion of the carbonyl into the polyoxometallic framework activates the urea toward Hydrogen-bond catalysis. This was shown on the Friedel-Crafts arylation of trans-β-nitrostyrene. Modelling shows that the most stable form of the organo-POMs features a cis-trans arrangement of the two N−H bonds, but that the likely catalytically active trans-trans form is accessible at room temperature. Finally, it is possible that the oxo substituents next to the vanadium atoms may help the approach of the nucleophile via H-bonding.
Organo-Polyoxometalate-Based Hydrogen-Bond Catalysis / Vilona D.; Lelli M.; Dumont E.; Lacote E.. - In: CHEMISTRY-A EUROPEAN JOURNAL. - ISSN 0947-6539. - STAMPA. - 27:(2021), pp. 17761-17764. [10.1002/chem.202102807]
Organo-Polyoxometalate-Based Hydrogen-Bond Catalysis
Lelli M.
Writing – Review & Editing
;
2021
Abstract
Several urea-inserted organo-polyoxometalates (POMs) derived from polyoxotungstovanadate [P2V3W15O61]9− were prepared. The insertion of the carbonyl into the polyoxometallic framework activates the urea toward Hydrogen-bond catalysis. This was shown on the Friedel-Crafts arylation of trans-β-nitrostyrene. Modelling shows that the most stable form of the organo-POMs features a cis-trans arrangement of the two N−H bonds, but that the likely catalytically active trans-trans form is accessible at room temperature. Finally, it is possible that the oxo substituents next to the vanadium atoms may help the approach of the nucleophile via H-bonding.File | Dimensione | Formato | |
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Chemistry A European J - 2021 - Vilona - Organo‐Polyoxometalate‐Based Hydrogen‐Bond Catalysis.pdf
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