Abstract
Cyclic and linear ketones were readily oxidised with Oxone ® at 40 °C in ionic liquids as solvents and short times (2.5–20 h), affording their corresponding lactones and esters in high yields (65–95%). Both, aprotic and protic ionic liquids were used. The best conversion of ketones and the highest yields of products were obtained with 1-buty-3-methylimidazolium tetrafluoroborate and 1-methylimidazolium acetate as solvents. These ionic liquids were also efficiently recycled in the Baeyer–Villiger reaction without significant loss of activity. Several factors, such as the partial solubility of KHSO 5 in the ionic liquid, its viscosity and the presence of a proton in protic ionic liquids, have an influence on the course of the reaction.
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