In the presence of oxygen atom donors [XO, e.g., m-chloroperbenzoic acid (m-CPBA), o-tert-butylsulfone iodosyl benzene (ArIO)] the benzyl group of the ligand in a mixed-valent FeIIFeIII complex is almost quantitatively ortho-hydroxylated to a phenolate terminally bound to one iron in the derived FeIIIFeIII complex. All available experimental evidence concurs to suggest that this reaction involves an oxo-FeIVFeIV intermediate.
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Avenier et al. (2004) studied this question.
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