1,4-Conjugate addition reaction catalyzed by a homogeneous rhodium catalyst entrapped in hydrophobized ordered mesoporous silica
| Autor: | Paul Handa, Yves Castanet, Krister Holmberg, Mathieu Sauthier, André Mortreux |
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| Rok vydání: | 2008 |
| Předmět: |
Addition reaction
Aqueous solution Inorganic chemistry chemistry.chemical_element Homogeneous catalysis General Chemistry Mesoporous silica Condensed Matter Physics Catalysis law.invention Rhodium chemistry.chemical_compound chemistry Mechanics of Materials law General Materials Science Methyl acrylate Filtration |
| Zdroj: | Microporous and Mesoporous Materials. 116:424-431 |
| ISSN: | 1387-1811 |
| Popis: | A 1,4-conjugate addition reaction between p-carboxyphenylboronic acid and methyl acrylate has been performed using a homogenous rhodium catalyst entrapped in the hydrophobic pores of hydrophobized ordered mesoporous silica. The catalyst-loaded inorganic particles were dispersed in an aqueous solution containing the reactants. The yields obtained were higher than that obtained in the conventional liquid-liquid two-phase system. From the recycling experiments it was demonstrated that with hydrophobized ordered mesoporous silica as support a catalytic activity extending over several consecutive runs compared to the liquid-liquid two-phase system could be obtained. The major advantage with having the catalyst "heterogenized" by entrapment into the siliceous material is the simplicity of the work-up process. The porous particles, containing the catalyst, are simply removed by filtration after completed reaction and the product precipitated from water upon acidification. |
| Databáze: | OpenAIRE |
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