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- W1977555480 endingPage "5174" @default.
- W1977555480 startingPage "5164" @default.
- W1977555480 abstract "Abstract Divacant Keggin‐type polyoxotungstates [γ‐XW 10 O 36 ] 8– with X = Si or Ge, were functionalized with chiral phosphoryl groups. The hybrid compounds [(R*PO) 2 (γ‐XW 10 O 36 )] 4– with R = N ‐protected aminoalkyl groups or O ‐protected amino acid derivatives, were isolated. The solution characterization of the products was performed by different techniques: 183 W, 31 P, 13 C, and 1 H NMR spectroscopy, electrospray ionization mass spectrometry, UV/Vis spectroscopy, and circular dichroism (CD). The experimental data confirm the covalent grafting of the organic moieties onto the polyanionic surface. A chirality transfer, from the pendant organic arm to the inorganic framework is apparent from CD studies. Multiple Cotton effects were observed in the region of charge‐transfer transitions pertaining to W–O bonds. Furthermore, the 183 W NMR spectra are consistent with the expected C 2 symmetry, resulting from introduction of two organic stereocenters. The title complexes were used in the presence of hydrogen peroxide to perform the oxidation of methyl p ‐tolyl sulfide. Implications for the design of enantioselective catalysts based on these derivatives are discussed. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)" @default.
- W1977555480 created "2016-06-24" @default.
- W1977555480 creator A5012522215 @default.
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- W1977555480 creator A5073044011 @default.
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- W1977555480 creator A5090149461 @default.
- W1977555480 date "2009-11-17" @default.
- W1977555480 modified "2023-10-07" @default.
- W1977555480 title "Optically Active Polyoxotungstates Bearing Chiral Organophosphonate Substituents" @default.
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- W1977555480 doi "https://doi.org/10.1002/ejic.200900728" @default.
- W1977555480 hasPublicationYear "2009" @default.
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