Abstract
The oxygenation of 4-alkyl-2,6-di- t -butylphenols ( 2 ) with Co(II)-Schiff's base complexes in aprotic solvents such as CH 2Cl 2, THF, Py, and DMF leads to highly selective formation of the corresponding peroxy- p -quinolato Co(III) complexes. The reaction proceeds by mechanism involving a rate determining hydrogen abstraction by superoxo Co(III) species from 2 giving phenoxy radical, rapid step of electron transfer from Co(II) complex to the phenoxy radical, and dioxygen incorporation into phenolato Co(III) complex thus formed.
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