期刊
CATALYSIS COMMUNICATIONS
卷 9, 期 13, 页码 2239-2243出版社
ELSEVIER
DOI: 10.1016/j.catcom.2008.05.004
关键词
secondary alcohol oxidation; poly(ethylene glycol); carbon dioxide; cobalt
The aerobic oxidation of benzhydrol, 1-phenylethanol and cyclohexanol to corresponding ketones was carried out in poly(ethylene glycol) (PEG-600)/supercritical CO2 (SCCO2) biphasic system using unsupported and supported CoCl2 center dot 6H(2)O as the catalysts. It was demonstrated that CoCl2 center dot 6H(2)O, Co(II)/Al2O3, and Co(II)/ZnO were all active and selective for the reactions. The reactivity of the substrates followed the order benzhydrol > 1-phenylethanol > cyclohexanol. Co(II)/ZnO was most stable and could be reused four times without considerable reduction of activity. The effect of CO2 pressure, reaction time and solvent was further investigated. The Co(II)/ZnO/PEG-600 system is active, selective, cheap, clean, and recyclable for the aerobic oxidation of secondary alcohols. (C) 2008 Elsevier B.V. All rights reserved.
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