Application of Hydrogen Peroxide Encapsulated in Silica Xerogels to Oxidation Reactions

Molecules

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

DOI  :  10.3390/molecules17078068

来源: DOAJ

【 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】

Unknown