2007•Journal of Molecular Catalysis(China)Requires access
Preparation of Cyclohexanone through Oxidation of Cyclohexanol Using Ionic Liquids as Phase Transfer Catalysts
Jian‐Guo Yang
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Abstract
Cyclohexanol was oxidized to cyclohexanone under a mild condition with Na2WO4.2H2O as catalyst,H2O2 as oxidizing agent and ionic liquids as phase transfer catalysts.The effects of different phase transfer catalysts,the amount of catalyst Na2WO4.2H2O,the amount of H2O2,reaction time,and temperature on the oxidation of cyclohexanol also were studied.The results showed that ionic liquids(\[C16mim\]HSO4 and \[C14mim\]HSO4)were a kind of efficient phase transfer catalysts for the oxidation of cyclohexanol.The conversion of cyclohexanol and the selectivity to cyclohexanone were about 100% and 99% respectively under optimum reaction conditions(cyclohexanol 0.1 mol,30% H2O2 25 mL,phase transfer catalyst 4.0 mmol,catalyst Na2WO4 2H2O 5.5 mmol,90℃ for 50 min).The activity of phase transfer catalysts still keep high stability after reused 5 times.