Oxidation of cycloalkanes with hydrogen peroxide in the presence of Keggin-type polyoxotungstates

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• 作者：Má ; rio M. Q. Simõ ; es ; Isabel C. M. S. Santos ; M. Salete S. Balula ; José ; A. F. Gamelas ; Ana M. V. Cavaleiro ; M. Graç ; a P. M. S. Neves ; José ; A. S. Cavaleiro
• 刊名：Catalysis Today
• 出版年：2011
• 出版时间：2011
• 年：2011
• 卷：91-92
• 期：Complete
• 页码：211-214
• 全文大小：77 K

文摘

The catalytic homogeneous oxidation of cyclohexane and cyclooctane in acetonitrile with hydrogen peroxide in the presence of the tetrabutylammonium salts of Keggin-type polyoxotungstates [XW₁₁O₃₉]ⁿ⁻ and [XW₁₁MO₃₉]^(n−m)− (X=P, Si, B and M^III=Fe, Mn) afforded substantial amounts of the corresponding alkyl hydroperoxides. The cyclododecane oxidation reactions only gave rise to the alcohol and ketone. Under the used reaction conditions, high turnover numbers were obtained, reaching 614 in the cyclooctane oxidation after 9 h of reaction. These oxidation reactions appear to be radical processes, since they were totally inhibited in the presence of 2,6-di-tert-butyl-4-methylphenol or I₂, two well-known radical scavengers.