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Issue 1, 2017
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Tailored oxido-vanadium(V) cage complexes for selective sulfoxidation in confined spaces

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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.

Graphical abstract: Tailored oxido-vanadium(V) cage complexes for selective sulfoxidation in confined spaces

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Publication details

The article was received on 11 Jul 2016, accepted on 04 Sep 2016 and first published on 05 Sep 2016


Article type: Edge Article
DOI: 10.1039/C6SC03045A
Citation: Chem. Sci., 2017,8, 789-794
  • Open access: Creative Commons BY license
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    Tailored oxido-vanadium(V) cage complexes for selective sulfoxidation in confined spaces

    D. Zhang, K. Jamieson, L. Guy, G. Gao, J. Dutasta and A. Martinez, Chem. Sci., 2017, 8, 789
    DOI: 10.1039/C6SC03045A

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