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Application of Hydrogen Peroxide Encapsulated in Silica Xerogels to Oxidation Reactions
Chair of Biotechnology and Renewable Materials, Cracow University of Technology, Warszawska 24, 31-155 Krakow, Poland
* Author to whom correspondence should be addressed.
Received: 13 May 2012; in revised form: 18 June 2012 / Accepted: 25 June 2012 / Published: 4 July 2012
Abstract: Hydrogen peroxide was encapsulated into a silica xerogel matrix by the sol-gel technique. The composite was tested as an oxidizing agent both under conventional and microwave conditions in a few model reactions: Noyori’s method of octanal and 2-octanol oxidation and cycloctene epoxidation in a 1,1,1-trifluoroethanol/Na2WO4 system. The results were compared with yields obtained for reactions with 30% H2O2 and urea-hydrogen peroxide (UHP) as oxidizing agents. It was found that the composite has activity similar to 30% H2O2 and has a several advantages over UHP such as the fact that silica and H2O are the only products of the composite decomposition or no contamination by urea or its derivatives occurs; the xerogel is easier to heated by microwave irradiation than UHP and could be used as both an oxidizing agent and as solid support for microwave assisted solvent-free oxidations.
Keywords: oxidation; epoxidation; microwave irradiation; silica xerogel; hydrogen peroxide; sol-gel; fluoroalcohols; urea-hydrogen peroxide
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MDPI and ACS Style
Bednarz, S.; Ryś, B.; Bogdał, D. Application of Hydrogen Peroxide Encapsulated in Silica Xerogels to Oxidation Reactions. Molecules 2012, 17, 8068-8078.
Bednarz S, Ryś B, Bogdał D. Application of Hydrogen Peroxide Encapsulated in Silica Xerogels to Oxidation Reactions. Molecules. 2012; 17(7):8068-8078.
Bednarz, Szczepan; Ryś, Barbara; Bogdał, Dariusz. 2012. "Application of Hydrogen Peroxide Encapsulated in Silica Xerogels to Oxidation Reactions." Molecules 17, no. 7: 8068-8078.