Organo-Polyoxometalate-Based Hydrogen-Bond Catalysis.
Chemistry
; 27(71): 17761-17764, 2021 Dec 20.
Article
em En
| MEDLINE
| ID: mdl-34643968
ABSTRACT
Several urea-inserted organo-polyoxometalates (POMs) derived from polyoxotungstovanadate [P2 V3 W15 O61 ]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-ß-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.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ureia
/
Vanádio
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article