Active species formed in a Fenton-like system in the medium of triethylammonium acetate ionic liquid for hydroxylation of benzene to phenol

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• 作者：Xiaoke Hu^a ; Liangfang Zhu^a ; Xueqin Wang^a ; Bin Guo^a ; Jiaquan Xu^a ; Guiying Li^a ; Changwei Hu ; ^a ; ^{chwehu@mail.sc.cninfo.net"" rel=""nofollow} ; ^{gchem@scu.edu.cn"" rel=""nofollow}
• 关键词：Iron(IV)-oxo species ; Hydroxyl radical ; Mechanism ; Over-oxidation ; Prohibition effect
• 刊名：Journal of Molecular Catalysis A: Chemical
• 出版年：2011
• 出版时间：1 June 2011
• 年：2011
• 卷：342-343
• 期：Complete
• 页码：41-49
• 全文大小：542 K

文摘

High-valent iron(IV)-oxo species was proved to be the main oxidizing species for hydroxylation of benzene to phenol by a Fenton-like reagent in triethylammonium acetate ionic liquid via UV–vis and ESI-MS characterization, while hydroxyl radical was excluded by detailed investigations. It was found that the formation of hydroxyl radical was prohibited by the reduction of redox potential of Fe(III)/Fe(II) couple in triethylammonium acetate medium, leading to a decreased over-oxidation of benzene than that in aqueous solution. The reaction mechanisms for hydroxylation of benzene, as well as for over-oxidation of phenol by iron(IV)-oxo species were proposed. The latter is partly prohibited by the hydrogen-bond interaction between as-produced phenol and acetate anion of the ionic liquid.