Photooxidation of 2-hydroxy acids by copper(II) species in aqueous solution.
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概要
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Ultraviolet irradiation of aqueous lactic, glycolic, or 2-hydroxybutanoic acid in the presence of copper(II) leads to photoredox reaction to give corresponding α-keto acid, aldehyde with evolution of carbon dioxide, and the precipitate of copper(I). The mole ratio of the carbonyl products to the consumption of copper(II) is close to 0.5. Oxidative decarboxylation dominates at pH>1 while the formation of α-keto acids favors at lower pH. The formation of α-keto acids is selectively suppressed by the addition of free radical scavengers. Free radical oxidations of the acids with bromine atom or benzoyl radicals give exclusively α-keto acids. The reaction mechanism has been discussed.
- 公益社団法人 日本化学会の論文
著者
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Matsushima Ryoka
Department Of Applied Chemistry Faculty Of Engineering Shizuoka University
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Kuwabara Katsuyuki
Department Of Surgery School Of Medicine Keio University
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Ichikawa Yoshinori
Department of Industrial Chemistry, Faculty of Engineering, Shizuoka University
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