Immobilization of ruthenium(II) salen complexes on poly(4-vinylpyridine) and their application in catalytic aldehyde olefination |
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Authors: | Syukri Syukri Fritz E Kühn |
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Institution: | a Department of Chemistry, Technische Universität München, Lichtenbergstraße 4, D-85747 Garching, Germany b Department of Chemistry, Instituto Tecnológico e Nuclear (ITN), Estrada Nacional No. 10, 2686-953 Sacavém, Portugal |
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Abstract: | Two Ru(II)(salen)(PPh3)2 complexes grafted on poly(4-vinylpyridine) have been synthesized and characterized. An elemental analysis shows that both grafted samples contain ca. 0.6 wt % Ru. FTIR spectra confirm the formation of metal-salen complexes attached to the carrier polymer by an interaction between the ruthenium(II) compounds with the pyridine nitrogen atoms of the poly(4-vinylpyridine). Immobilization of both Ru(II) salen complexes on the polymer increases their thermal stability as demonstrated by TG-MS analysis. The grafted materials were applied as catalysts for the olefination of various aldehydes at 60 °C under an inert gas atmosphere, showing comparable yields as their homogeneous congeners and high trans-selectivities. The ruthenium(II) compound with a larger salen ligand shows a better recyclability and selectivity than the derivative with the smaller ligand. |
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Keywords: | Catalysis Heterogenization Olefination Polymer Ruthenium |
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