One-pot cascade reactions catalyzed by acid-base mesoporous MCM-41 materials

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• 作者：Fanpeng Shang^a ; ^b ; Jianrui Sun^a ; Heng Liu^a ; Chunhua Wang^a ; Jingqi Guan^a ; ^{guanjq@jlu.edu.cn} ; Qiubin Kan^a ; ^{qkan@mail.jlu.edu.cn}
• 关键词：B. Chemical synthesis ; B. Sol&ndash ; gel chemistry ; C. X-ray diffraction ; D. Catalytic properties
• 刊名：Materials Research Bulletin
• 出版年：2012
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：March, 2012
• 卷：47
• 期：3
• 页码：801-806
• 文件大小：445 K

摘要

Acid-base bifunctional mesoporous materials (AB-MCM-41) with aminopropyl and propanesulfonic acid in the same mesoporous material have been synthesized by two different methods: postsynthetic grafting and direct synthesis. AB-MCM-41-g was gained by the modification of SO₃H-MCM-41 surfaces with organic amine functional groups, while AB-MCM-41-co was prepared through co-condensation of trialkoxyorganosilanes with tetraethyl orthosilicate. The bifunctional samples possess hexagonal arrays of uniform pores, large surface area, high pore volume and excellent acid-basic properties. One-pot acid-base cascade reactions were wonderfully achieved in the presence of the efficient acid-base catalysts, which demonstrate the coexistence of acid and base sites in the same material. In addition, the AB-MCM-41-g possesses higher activity for one-pot deacetalization-Knoevenagel and deacetalization-nitroaldol (Henry) reactions in contrast to AB-MCM41-co and this outcome is achieved under simpler synthetic conditions utilizing less time and less material.