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• W2070180416 abstract "Abstract Catalytic activity of Co(II)—Schiff base complexes toward selective oxygenation of organic molecules related to biological systems has been reviewed. The complexes display (i) dioxygenase-type activity (selective oxygenolyses of 3-substituted indoles and flavonols, and regioselective dioxygen incoporation into 2,6-di-butylphenols yielding peroxyquinolato Co(III) complexes), (ii) monooxygenase- and/or phenolase-type activity (selective formation of p -quinols and benzoquinones from phenols), and (iii) peroxidase-type activity (one electron oxidation of phenols and oxidative cleavage of ether bond of p -phenoxyphenols). Preliminary kinetic studies on the regioselective peroxyquinolato Co(III) complex formation show that the reaction involves a rate-determining hydrogen abstraction from the phenol substrate by a superoxo Co(III) complex initially formed, followed by rapid reduction of the resulting phenoxy radical with Co(II) species leading to the formation of a phenolato Co(III) complex, to which dioxygen is incorporated. This mechanism may be supported by the reaction of phenols and phenoxy radicals with other superoxo Co(III) complexes, [(CN) 5 Co(III) (O 2 )] 3− and [(3-MeOSalen)Co(III)(O 2 )]. In all the selective oxidations, the role of cobalt—dioxygen complexes is to activate substrates, and the selectivity results from the coordination of thus activated substrates to Co(III) species to form key intermediates, into which dioxygen is incorporated." @default.
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• W2070180416 date "1980-02-01" @default.
• W2070180416 modified "2023-09-26" @default.
• W2070180416 title "Model Catalytic oxygenations with Co(II)—Schiff base complexes and the role of cobalt-oxygen complexes in the oxygenation process" @default.
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• W2070180416 doi "https://doi.org/10.1016/0304-5102(80)85017-6" @default.
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