title: Application of hydrogen peroxide encapsulated in silica xerogels to oxidation reactions.
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.
authors: Cracow University of Technology, Warszawska 24, 31-155 Krakow, Poland. rysq86@o2.pl
authors: Szczepan
authors: S
authors: Bednarz
authors: Barbara
authors: B
authors: Ryś
authors: Dariusz
authors: D
authors: Bogdał
mesh_terms: D004852:Epoxy Compounds / Q000737:chemistry; D005782:Gels / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D008872:Microwaves; D008956:Models, Chemical; D000442:Octanols / Q000737:chemistry; D010084:Oxidation-Reduction; D012822:Silicon Dioxide / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman
chemical_list: D004852:Epoxy Compounds; D005782:Gels; D000442:Octanols; C067943:2-octanol; D012822:Silicon Dioxide; D006861:Hydrogen Peroxide