Journal
TETRAHEDRON
Volume 63, Issue 29, Pages 6784-6790Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2007.04.073
Keywords
nanostructured hybrid silica; Heck reaction; Sonogashira reaction; cyanation; imidazolium salts
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Nanostructured hybrid silica bearing pyridine binding sites was prepared in a template assisted hydrolysis-polycondensation of tetraethylorthosilicate (TEOS) and the ionic precursor N, N- dimethyl- pyridin-4-yl-(3-triethoxysilyl-propyl)-ammonium iodide using N-dodecyl-N'- methyl-imidazolium bromide as structure directing agent. After treatment with palladium acetate, the material appeared as a versatile heterogeneous catalyst for Heck, Sonogashira, and cyanation reactions. In Heck and Sonogashira cross-coupling reactions, unchanged catalytic activity was observed in at least five reaction cycles. (c) 2007 Elsevier Ltd. All rights reserved.
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