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Supercritical carbon dioxide, a new medium for aerobic alcohol oxidations catalysed by copper-TEMPO

Opened Access Supercritical carbon dioxide, a new medium for aerobic alcohol oxidations catalysed by copper-TEMPO

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Autor: Herbert, Matthew
Montilla Ramos, Francisco Javier
Galindo del Pozo, Agustín
Departamento: Universidad de Sevilla. Departamento de Química Inorgánica
Fecha: 2010
Publicado en: Dalton Transactions, 39(3), 900-907
Tipo de documento: Artículo
Resumen: The copper catalysed aerobic oxidation of selected alcohol substrates in supercritical carbon dioxide (scCO2), employing a range of simple copper(II) catalyst compounds, is here described. The copper acetate complex of polydimethylsiloxane (PDMS) functionalised pyridine (1), compound 2, has previously been synthesised and characterised by us and its solubility in scCO2 demonstrated. Due to this solubility we anticipated that the selective aerobic oxidation of alcohols to aldehydes could be homogeneously catalysed by this compound in scCO2 in combination with the co-catalyst 2,2,6,6-tetramethylpiperidin-1-yloxy free radical (TEMPO). Our initial results showed that complete oxidation of 4-nitrobenzyl alcohol was achieved within 4 h of reaction. However, the activities of analogous copper derivatives containing simpler pyridine substituents, [Cu(AcO)2(py)]2 and [Cu(AcO)2(4VP)]2 (4VP = 4-vinylpyridine), were shown to be similar, in spite of their negligible solubility in scCO2. When we re...
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Tamaño: 175.0Kb
Formato: PDF

URI: http://hdl.handle.net/11441/28087

DOI: 10.1039/B914788H

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