文献类型：期刊文献

英文题名：Niobium Peroxide-Catalyzed Selective Epoxidation of Allylic Alcohols

作者：Chen, Chen[1];Zhao, Xiuge[1];Chen, Jizhong[1];Hua, Li[1];Zhang, Ran[1];Guo, Li[1];Song, Baoning[1];Gan, Huimei[1];Hou, Zhenshan[1]

机构：[1]E China Univ Sci & Technol, Res Inst Ind Catalysis, Key Lab Adv Mat, Shanghai 200237, Peoples R China

年份：2014

卷号：6

期号：11

起止页码：3231

外文期刊名：CHEMCATCHEM

收录：;EI(收录号：20153401181753);WOS:【SCI-EXPANDED(收录号:WOS:000344330800030)】；

基金：We gratefully acknowledge support from the National Natural Science Foundation of China (U1179302 and 21373082), the Research Fund for the Doctoral Program of Higher Education of China (20100074110014), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：alcohols; amphiphiles; epoxidation; niobium; peroxides

摘要：Modified niobium peroxides were prepared and used for catalyzing the epoxidation of allylic alcohols with hydrogen peroxide in the absence of any other solvent under ice bath conditions. Niobium peroxides modified with ionic liquid-type 1-dodecyl-3-methylimidazolium hydroxide or conventional tetradecyl trimethyl ammonium hydroxide surfactants demonstrated excellent yields (80-99%) for the epoxidation of allylic alcohols to their epoxides even if the reaction was performed without any other solvent at 0 degrees C for 0.5 h. The catalyst characterization demonstrated that the surfactant molecules were anchored on the surface of the niobium catalyst by weak non-covalent interactions. Compared with niobium peroxides, the modified amphiphilic catalysts allowed easier accessibility to hydrophobic substrates and thus demonstrated high reaction rate and excellent recyclability for the epoxidation under mild conditions.