English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/52659
Compartir / Impacto:
Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL

Efficient enhancement of copper-pyridineoxazoline catalysts through immobilization and process design

AutorAranda, C.; Fraile, José M. ; Mayoral, José A. ; Martínez-Merino, Víctor
Fecha de publicación2011
EditorRoyal Society of Chemistry (Great Britain)
CitaciónGreen Chemistry 13(4): 983-990 (2011)
ResumenCopper-pyridineoxazoline (Cu-pyox) complexes are poor homogeneous catalysts for asymmetric cyclopropanation reactions. Pyox ligands have been immobilized by polymerization of monomers possessing a vinyl group directly attached to position 6 with styrene and divinylbenzene. The corresponding heterogeneous catalysts show a significant enhancement in enantioselectivity, up to 7-fold that of the analogous homogeneous Cu-pyox catalysts. This effect is due to a synergic effect between the proximity of the polymeric backbone and the presence of a bulky substituent in the chiral oxazoline ring around copper. The obtained values of enantioselectivity are similar to those found with supported C 2-symmetric bis(oxazolines), but with only half the chiral information given the presence of only one oxazoline ring in pyox. Besides, the co-polymerization in the presence of the right porogen inside a column allows the preparation of monolithic mini-flow reactors. Continuous flow processes contribute to further improve the catalytic efficiency in both classical solvents (dichloromethane) and neoteric greener ones, such as supercritical CO2. The use of scCO2 as solvent yields the same selectivities obtained in batch processes in combination with higher productivity avoiding the use of VOC. © The Royal Society of Chemistry.
Identificadoresdoi: 10.1039/C0GC00775G
issn: 1463-9262
e-issn: 1463-9270
Aparece en las colecciones: (ICMA) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
accesoRestringido.pdf15,38 kBAdobe PDFVista previa
Mostrar el registro completo

Artículos relacionados:

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.