Abstract
Magnesium oxide-supported polytitazane copper complex is prepared and found to be a very effective catalyst for the Baeyer-Villiger oxidation of ketones and cyclohexanol in the presence of an aldehyde as a reductant under an atmospheric pressure of oxygen at room temperature. The δ-valerolactone and δ-caprolactone can be obtained in high than 97% yield. The reactivity of ketones decreases as fellow: cycloketones > acetophenone > aliphatic ketone. It is found that cyclohexanol is selectively oxidized to ϵ-caprolactone in 77% yield and 89% selectivity by the above combined catalytic system. The catalyst is also very stable and can be reused at least six times without loss of its activity.
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