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The conversion of cyclic ketones to lactones was catalyzed by different acid catalysts using aqueous hydrogen peroxide (30 wt%) as a clean oxidant. H 3 PW 12 O 40  seems to be a rather efficient and highly selective catalyst for the Baeyer-Villiger reaction of 2-heptylcyclopentanone and 2-adamantanone to lactones. For cyclopentanone, cyclohexanone, cycloheptanone and cyclododecanone, the selectivity for lactones was very poor, but selectivity for acids was high.

Baeyer-Viiliger Oxidation of Cyclic Ketones Using Aqueous Hydrogen Peroxide Catalyzed by Heteropolyacids in Solvent-free System