Application of Hydrogen Peroxide Encapsulated in Silica Xerogels to Oxidation Reactions

Molecules

Szczepan Bednarz¹  Barbara Ryś¹ 

[1] Chair of Biotechnology and Renewable Materials, Cracow University of Technology, Warszawska 24, 31-155 Krakow, Poland

关键词: oxidation;    epoxidation;    microwave irradiation;    silica xerogel;    hydrogen peroxide;    sol-gel;    fluoroalcohols;    urea-hydrogen peroxide;   

DOI  :  10.3390/molecules17078068

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.