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Chem Sci. 2017 Jan 1;8(1):789-794. doi: 10.1039/c6sc03045a. Epub 2016 Sep 5.

Tailored oxido-vanadium(V) cage complexes for selective sulfoxidation in confined spaces.

Author information

1
Shanghai Key Laboratory of Green Chemistry and Chemical Processes , School of Chemistry and Molecular Engineering , East China Normal University , 3663 North Zhongshan Road , Shanghai , 200062 , P. R. China.
2
Laboratoire de Chimie , École Normale Supérieure de Lyon , CNRS , UCBL , 46 allée d'Italie , F-69364 Lyon , France.
3
Aix Marseille Univ , CNRS , Centrale Marseille , iSm2 , Marseille , France . Email: alexandre.martinez@centrale-marseille.fr.

Abstract

Five sets of oxido-vanadium(V) complexes, which include both cages and open structures, were prepared and tested in the catalytic oxidation of sulfides. It was found that the hemicryptophane complexes, which are simultaneously comprised of cyclotriveratrylene (CTV), binaphthol and oxido-vanadium(V) moieties, are the most efficient supramolecular catalysts. The specific shape of the confined hydrophobic space above the metal center leads to a strong improvement in the yield, selectivity and rate of the reaction, compared to the other catalysts investigated herein. A remarkable turnover number (TON) of 10 000 was obtained, which can be attributed to both the high reactivity and stability of the catalyst. Similarly to enzymes, the kinetic analysis shows that the mechanism of oxidation with the supramolecular catalysts obeys the Michaelis-Menten model, in which initial rate saturation occurs upon an increase in substrate concentration. This enzyme-like behavior is also supported by the competitive inhibition and substrate size-selectivity observed, which underline the crucial role played by the cavity.

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