Abstract 1,2-Cyclohexanediones were found to be dioxygenated by molecular oxygen with the aid of cupric ion to afford 1,5-keto acids and carbon monoxide. The reaction proceeds possibly via an endoperoxide intermediate. Methyl α-hydroxyadipates were also formed as byproducts. The mechanism of oxygenation is discussed.
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Utaka et al. (1984) studied this question.
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