Abstract
New hybrid silica materials M1-M4, derived from mono and bis-silylated aryl iodides, have been prepared via sol-gel processes, either by the hydrolytic polycondensation of a bis-silylated monomer or by the co-gelification of a monosilylated precursor with tetraethylorthosilicate. They have been fully characterized by elemental analysis, 13C and 29Si CP-MAS solid state NMR, IR, TGA, and nitrogen-sorption measurements. These organosilicas have been successfully applied as supported catalysts in the α-tosyloxylation of aliphatic ketones in the presence of m-chloroperbenzoic acid (m-CPBA) as an oxidant, with the corresponding α-tosyloxyketones obtained in moderate to good isolated yields. The recyclability of the supported catalysts by a simple filtration has also been investigated. © 2012 Elsevier Ltd. All rights reserved.
Original language | English |
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Pages (from-to) | 192-199 |
Journal | Reactive and Functional Polymers |
Volume | 73 |
Issue number | 1 |
DOIs | |
Publication status | Published - 1 Jan 2013 |
Keywords
- Hybrid silica
- Hypervalent iodine
- Oxidative α-tosyloxylation
- Recyclable catalyst
- Sol-gel