Baeyer−Villiger Oxidation in Supercritical CO2 with Potassium Peroxomonosulfate Supported on Acidic Silica Gel
journal contributionposted on 18.08.2006 by María E. González-Núñez, Rossella Mello, Andrea Olmos, Gregorio Asensio
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Supercritical carbon dioxide (scCO2) is an efficient reaction medium to perform the Baeyer−Villiger oxidation with hydrated silica-supported potassium peroxomonosulfate (h-SiO2·KHSO5) under flow-through conditions. Hydration modulates the reactivity of the active surface by softening the acidity of the KHSO4 present in the supported reagent. The reaction in scCO2 is much more efficient than in n-hexane under similar conditions, which is attributed to better transport and solvating properties of the supercritical medium with regard to n-hexane.