Base-catalyzed autoxidation of fluorene in the presence of phase transfer catalysts.

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概要

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• Base-catalyzed autoxidation of fluorene to fluorenone has been carried out in an aqueous potassium hydroxide–benzene two-phase system in the presence of 18-crown-6 as a phase transfer catalyst. The initial rate of oxidation is proportional to the amount of fluorene. The addition of 18-crown-6 leads to the increased concentration of potassium hydroxide and water in the benzene phase, which is responsible for the increased rate of oxidation. Increasing the concentration of potassium hydroxide in the aqueous phase increases the concentration of 18-crown-6 and potassium hydroxide in benzene, resulting in a large increase in the rate of oxidation. The ease of oxidation with respect to the base is KOH>NaOH>LiOH>Ba(OH)<SUB>2</SUB>. Less polar solvents such as cyclohexane used as an organic phase decrease the oxidation rate.

• 公益社団法人 日本化学会の論文

著者

• ISHIKAWA Shinji

  Department of Agricultural Chemistry, Faculty of Agriculture, Niigata University

• Hashimoto Harukichi

  Department of Applied Chemistry, Faculty of Engineering, Tohoko University

• Yamashita Junzo

  Department of Applied Chemistry, Faculty of Engineering, Tohoku University

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