期刊
NANOSCALE RESEARCH LETTERS
卷 10, 期 -, 页码 -出版社
SPRINGER
DOI: 10.1186/1556-276X-10-2
关键词
Recyclable; Magnetic; FeCo/GC; Propargylic substitution; Phosphomolybdic acid
资金
- National Research Foundation of Korea (NRF) through the Human Resource Training Project for Regional Innovation [2012H1B8A2026225]
- 2-year Research Grant of Pusan National University
- Ministry of Education (MOE)
- National Research Foundation of Korea [2012H1B8A2026225] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Phosphomolybdic acid (PMA, H3PMo12O40) functioned as a catalyst for reactions of secondary propargylic alcohols and nucleophiles. Highly stable and magnetically recyclable mesoporous silica spheres (MMS) embedded with FeCo-graphitic carbon shell nanocrystals (FeCo/GC@MSS) were fabricated by a modified Stober process and chemical vapor deposition (CVD) method. The FeCo/GC@MSS were loaded with phosphomolybdic acid (PMA@FeCo/GC@MSS), and their catalytic activity was investigated. Propargylic reactions of 1,3-diphenyl-2-propyn-1-ol with a wide range of nucleophiles bearing activating substituents were catalyzed under mild conditions. It was found that the MMS possess mesoporosities and have enough inner space to load FeCo and phosphomolybdic acid. The FeCo/GC@MSS were found to be chemically stable against acid etching and oxidation. This suggests that the nanocrystals can be used as a support for an acid catalyst. Moreover, the magnetic property of the nanocrystals enabled the facile separation of catalysts from the products.
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