Mild and highly efficient transfer hydrogenation of aldehyde and ketone catalyzed by rubidium phosphate

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• 作者：Yun-jing Huang 黄云敬 ; Wei-jun Yang 阳卫军…
• 刊名：Journal of Central South University
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：23
• 期：7
• 页码：1603-1610
• 全文大小：1,088 KB
• 刊物类别：Engineering
• 刊物主题：Engineering, general
  Metallic Materials
  Chinese Library of Science
  
• 出版者：Central South University, co-published with Springer
• ISSN：2227-5223
• 卷排序：23

文摘

Rubidium phosphate can be more conveniently obtained by extracting trace Rb+ from the salt lake brine. Rb₃PO₄ was found to be an excellent heterogeneous catalyst for transfer hydrogenation. Rb₃PO₄ lost 70% of its active sites after adsorbing water, but the remaining was not affected. The reductions of aldehydes and ketones, when promoted by Rb₃PO₄, were allowed at room temperature. The activities of substrates at room temperature followed a descending order of 2,6-dichlorobenzaldehyde>4-bromobenzaldehyde>benzaldehyde>acetophenone>anisaldehyde>butanone. A new catalytic cycle postulating a six-membered cyclic transition state for the reductions of aldehydes and ketones was proposed. These results exploited the catalytic usage of Rb₃PO₄ and worth in industrial application.Keywordsrubidium phosphatetransfer hydrogenationheterogeneous catalysiscyclic transition state