Fraile, José M. and García, José I. and Herrerías, Clara I. and Mayoral, José A. and Reiser, Oliver and Socuéllamos, Antonio and Werner, Heiko (2004) The role of binding constant in the efficiency of chiral catalysts immobilized by electrostatic interactions. The case of azabis(oxazoline)-copper complexes. Chemistry - A European Journal 10 (12), pp. 2997-3005.
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Other URL: http://dx.doi.org/10.1002/chem.200305739
As shown by theoretical calculations, azabis(oxazoline)-copper complexes are considerably more stable than the analogous bis(oxazoline)-copper complexes. This enhanced stability allows them to be efficiently immobilized by means of electrostatic interactions to different anionic supports, such as clays and nafion-silica nanocomposites, without the loss of a ligand, as is observed for bis(oxazolines). As a result, enantioselectivities of around 90 % ee are obtained in the cyclopropanation reaction between styrene and ethyl diazoacetate. Moreover, the solid catalyst is easily recoverable.
|Date:||21 June 2004|
|Institutions:||Chemistry and Pharmacy > Institut für Organische Chemie > Lehrstuhl Prof. Dr. Oliver Reiser|
|Keywords:||cyclopropanation; enantioselectivity; heterogeneous catalysts; immobilized catalysts; N ligands|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Unknown|
|Owner:||Helge Knüttel (ADMIN)|
|Deposited On:||04 Sep 2006|
|Last Modified:||05 Aug 2009 13:22|