A specific oxygenation of phenols to ortho ‐quinones can be effected by a combination of the transition metal complexes Ti(O i Pr) 4 , VO(acac) 2 , Zr(acac) 4 , Zr(O n Pr) 4 and tert ‐butylhydroperoxide (TBHP) or [Mo(O 2 ) 2 O] · Py · HMPT. Naphthols, anthracenols, phenanthrols and donor substituted mononuclear phenols are readily converted into the corresponding 1,2‐quinones. Unhindered ortho ‐naphthoquinones can yield binaphthyls with unreacted starting material by Michael addition.
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Krohn et al. (1989) studied this question.
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