<P>Phosphomolybdic acid (PMA, H<SUB>3</SUB>PMo<SUB>12</SUB>O<SUB>40</SUB>) functioned as a catalyst for reactions of secondary propargylic alcohols and nucleophiles. Highly stable and magnetically recyclable m...
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https://www.riss.kr/link?id=A107479013
2015
-
SCOPUS
학술저널
2
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<P>Phosphomolybdic acid (PMA, H<SUB>3</SUB>PMo<SUB>12</SUB>O<SUB>40</SUB>) functioned as a catalyst for reactions of secondary propargylic alcohols and nucleophiles. Highly stable and magnetically recyclable m...
<P>Phosphomolybdic acid (PMA, H<SUB>3</SUB>PMo<SUB>12</SUB>O<SUB>40</SUB>) 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 Stöber 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.</P>
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