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The ruthenium‐catalyzed oxidation of phenols with tert‐butylhydroperoxide efficiently gives the corresponding 4‐(tert‐butylperoxy)cyclohexadienones. The oxidation proceeds selectively because of ruthenium's ability for rapid single‐electron transfer. This biomimetic oxidation reaction is highly useful to obtain the metabolic compounds desired for confirming the safety of medicines and related compounds...
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