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

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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.
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Keywords: carbon dioxide; hexafluoroacetone; hydrogen peroxide; oxidation; porphyrin

Document Type: Review Article

Affiliations: Universita di Padova, Dipartimento di Chimica Organica; CNR, Istituto per la Tecnologia delle Membrane, Via Marzolo 1, 35131 Padova, Italia.

Publication date: 01 April 2004

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