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Letters in Organic Chemistry

Author(s): Sandro Campestrini, Alessandro Donoli and Umberto Tonellato

DOI: 10.2174/1570178043488329

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Embedded Mn-Porphyrins in PDMS and ORMOSILs as Effective Catalysts for Cyclooctene Epoxidation by H2O2 in Supercritical Carbon Dioxide

Page: [125 - 128] Pages: 4

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Abstract

The heterogeneous oxidation of cyclooctene with H2O2 catalyzed by Mnporphyrins embedded in polydimethylsiloxane (PDMS) and organically modified silicates (ORMOSILs), in the presence of hexafluoroacetone hydrate (HFAH) as cocatalyst, has been studied in supercritical carbon dioxide (scCO2) at 40°C and 20 MPa. Complete olefin conversion may be obtained with the formation of cyclooctene oxide as sole product, employing molar ratios of Mn-porphyrin/Substrate/H2O2 of 1:400:2000.

Keywords: carbon dioxide, hexafluoroacetone, hydrogen peroxide, oxidation, porphyrin