Dioxygen Adducts of Cobalt(II) Complexes of 6,6'-Bis(p-substituted benzoylamino)-2,2'-bipyridines and Their Cytalytic Activities in Oxygenation of 2,6-Di-tert-butylphenol

DOI: 10.1039/DT9930003647

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Journal of the Chemical Society, Dalton Transactions p. 3647 - 3652 (1993)

Update date:2022-08-24

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Authors:

Araki, Koji

Kuboki, Takashi

Otohata, Makihiro

Kishimoto, Nobuyuki

Yamada, Masaki

Shiraishi, Shinsaku

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Article abstract of DOI:10.1039/DT9930003647

The oxygen affinities and properties of oxygen adducts of complexes has been studied by cyclic voltammetry and IR, electronic and ESR spectroscopy.The complexes exhibited oxygen-binding ability in the presence of an appropriate axial base ligand (B), and the oxygen adducts were of the end-on bonded Co^III(O2(1-)) type (CoL(B)(O2)>.More complete electron transfer from the metal centre to the oxygen was indicated compared to that with .Electron-donating substituents gave higher concentrations of the oxygen adducts.The superior catalytic activity of these complexes, especially the Me- and Bu^t-substitued derivatives, in the oxygenation of 2,6-di-tert-butylphenol to the corresponding quinone is interpreted in terms of the reactivity of the co-ordinated oxygen and the oxygen affinity of the complexes.

Full text of DOI:10.1039/DT9930003647

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