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Para-hydrogen induced polarization in homogeneous phase-an example of how ionic liquids affect homogenization and thus activation of catalysts

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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