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

作者：Hu, Xiaoke; Zhu, Liangfang; Wang, Xueqin; Guo, Bin; Xu, Jiaquan; Li, Guiying; Hu, Changwei^*

来源：Journal of Molecular Catalysis A: Chemical , 2011, 342-43: 41-49.

DOI：10.1016/j.molcata.2011.04.008

• Iron(IV)-oxo species
• Hydroxyl radical
• Mechanism
• Over-oxidation
• Prohibition effect

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.

• 出版日期2011-6-1
• 单位四川大学