Catalytic Oxidation of Alkylbenzenes with Molecular Oxygen in Ionic Liquids

Chem. J. Chinese Universities

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Catalytic Oxidation of Alkylbenzenes with Molecular Oxygen in Ionic Liquids

LIU Yao-Hua^1,2, CUI Peng¹, SUN Jing¹, YANG Fan¹, TANG Jie¹

1. Department of Chemistry, East China Normal University, Shanghai 200062, China;
2. Department of Chemistry, Taiyuan Teacher's College, Taiyuan 030002, China

Received:2005-12-16 Revised:1900-01-01 Online:2006-12-10 Published:2006-12-10
Contact: YANG Fan

Abstract

Abstract: Using ionic liquid [Hex-mim]BF₄, [Bmim]BF₄, [Bmim]PF₆, and [Omim]BF₄as the solvent, respectively, the oxidation of alkylbenzenes by molecular oxygen was investigated under atmospheric pressure with Co(Ⅱ), Mn(Ⅱ), or Ni(Ⅱ)/NHPI (or AIBN) as the catalysts. The [Hex-mim]BF₄/Co²⁺(or Mn²⁺)/NHPI system was demonstrated efficient for the oxidation of alkylbenzene. Under the optimized condition, ethylbenzene, n-propylbenzene, and n-butylbenzene were oxidized to the corresponding aromatic ketone with yields up to 90%, 94%, and 93%, respectively, toluene and p-substituted toluene were oridized to benzoic acid and the corresponding p-substituted benzoic acid with yields of 32%—47%. The ionic liquid and metal catalyst could be reused by removing water from them under a reduced pressure.

Key words: Ionic liquid, Catalytic oxidation, Molecular oxygen, Alkylbenzene

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LIU Yao-Hua^1,2, CUI Peng¹, SUN Jing¹, YANG Fan¹, TANG Jie¹. Catalytic Oxidation of Alkylbenzenes with Molecular Oxygen in Ionic Liquids[J]. Chem. J. Chinese Universities, doi: .

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Catalytic Oxidation of Alkylbenzenes with Molecular Oxygen in Ionic Liquids

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