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• W2102214487 abstract "Abstract On the basis that thiacalix[4]arene (H 4 T4A) complex (PPh 4 ) 2 [H 2 T4A(VO 2 )] 2 ( Ia ) was found to be an adequate functional model for surface species occurring on vanadium oxide based catalysts and itself catalyses the oxidative dehydrogenation (ODH) of alcohols, an analogue containing 2,2′‐thiobis(2,4‐di‐ tert ‐butylphenolate), S L 2− , as ligand, namely, (PPh 4 ) 2 [ S LVO 2 ] 2 ( II ) was investigated in the same context. Despite the apparent similarity of Ia and II , studies on II revealed several novel insights, which are also valuable in connection with surfaces of vanadia catalysts: 1) For Ia and II similar turnover numbers (TONs) were found for the ODH of activated alcohols, which indicates that the additional OH units inherent to Ia do not contribute particularly to the activity of this complex, for instance, through prebinding of the alcohol. 2) On dissolution II enters into an equilibrium with a monomeric form, which is the predominant species in solution; nevertheless, ODH proceeds exclusively at the dimeric form, and this stresses the need for cooperation of two vanadium centres. 3) By omitting O 2 from the system during the oxidation of 9‐fluorenol, the reduced form of the catalyst could be isolated and fully characterised (including single‐crystal X‐ray analysis). The corresponding intermediate had been elusive in case of thiacalixarene system Ia . 4) Reoxidation was found to proceed via a peroxide intermediate that also oxidises one alcohol equivalent. As the peroxide can also perform mono‐ and dioxygenation of the thioether group in II , after a number of turnovers the active catalyst contains a sulfone group. The reduced form of this ultimate catalyst was also isolated and structurally characterised. Possible implications of 1)–4) for the function of heterogeneous vanadia catalysts are discussed." @default.
• W2102214487 created "2016-06-24" @default.
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• W2102214487 date "2011-09-13" @default.
• W2102214487 modified "2023-10-18" @default.
• W2102214487 title "Surface-Inspired Molecular Vanadium Oxide Catalysts for the Oxidative Dehydrogenation of Alcohols: Evidence for Metal Cooperation and Peroxide Intermediates" @default.
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• W2102214487 doi "https://doi.org/10.1002/chem.201101442" @default.
• W2102214487 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21915928" @default.
• W2102214487 hasPublicationYear "2011" @default.
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