Gutmann, T. ; Sellin, M. ; Breitzke, H. ; Stark, A. ; Buntkowsky, G. (2009)
Para-hydrogen induced polarization in homogeneous phase-an example of how ionic liquids affect homogenization and thus activation of catalysts.
In: Physical Chemistry Chemical Physics, 11 (40)
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Para-hydrogen induced polarization (PHIP) is observed in an organic solvent-free homogeneous catalyst/substrate system using ionic liquids. The hydrogenation reactions are performed employing a Rh-catalyst/ionic liquid system without further organic solvents. The PHIP phenomenon is demonstrated for the ethyl acrylate system. Small amounts of ionic liquids (ILs) containing weakly coordinating anions such as Tf(2)N(-) act as homogenizing cosolvents for the catalyst in ethyl acrylate, leading to a dramatic activation of the catalytic process and a high PHIP signal enhancement. The achieved enhancement depends strongly on the viscosity of the ethyl acrylate/IL mixture. Furthermore, by deliberate choice of the IL constituents it was possible to design a model system exhibiting both sufficient catalyst solubility and biphasic liquid-liquid behavior. This shows that in ionic liquids PHIP enhancements followed by a fast quantitative removal of the para-hydrogenated product from the catalyst phase is in principle possible. The possible PHIP enhancement factors will depend strongly on the design of a suitable hydrogenation reactor.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2009 |
| Autor(en): | Gutmann, T. ; Sellin, M. ; Breitzke, H. ; Stark, A. ; Buntkowsky, G. |
| Art des Eintrags: | Bibliographie |
| Titel: | Para-hydrogen induced polarization in homogeneous phase-an example of how ionic liquids affect homogenization and thus activation of catalysts |
| Sprache: | Englisch |
| Publikationsjahr: | 2009 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Chemistry Chemical Physics |
| Jahrgang/Volume einer Zeitschrift: | 11 |
| (Heft-)Nummer: | 40 |
| URL / URN: | http://apps.webofknowledge.com/full_record.do?product=WOS&se... |
| Kurzbeschreibung (Abstract): | Para-hydrogen induced polarization (PHIP) is observed in an organic solvent-free homogeneous catalyst/substrate system using ionic liquids. The hydrogenation reactions are performed employing a Rh-catalyst/ionic liquid system without further organic solvents. The PHIP phenomenon is demonstrated for the ethyl acrylate system. Small amounts of ionic liquids (ILs) containing weakly coordinating anions such as Tf(2)N(-) act as homogenizing cosolvents for the catalyst in ethyl acrylate, leading to a dramatic activation of the catalytic process and a high PHIP signal enhancement. The achieved enhancement depends strongly on the viscosity of the ethyl acrylate/IL mixture. Furthermore, by deliberate choice of the IL constituents it was possible to design a model system exhibiting both sufficient catalyst solubility and biphasic liquid-liquid behavior. This shows that in ionic liquids PHIP enhancements followed by a fast quantitative removal of the para-hydrogenated product from the catalyst phase is in principle possible. The possible PHIP enhancement factors will depend strongly on the design of a suitable hydrogenation reactor. |
| Freie Schlagworte: | parahydrogen-induced polarization situ phip-nmr stereoselective hydrogenation heterogeneous hydrogenation complexes rhodium c-13 hyperpolarization hydroformylation solvents |
| Zusätzliche Informationen: | 505MW Times Cited:15 Cited References Count:49 |
| Fachbereich(e)/-gebiet(e): | 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Physikalische Chemie |
| Hinterlegungsdatum: | 27 Okt 2014 20:42 |
| Letzte Änderung: | 29 Mai 2019 08:23 |
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