title: Polytopic bis(oxazoline)-based ligands for recoverable catalytic systems applied to the enantioselective Henry reaction.
abstract: Several kinds of polytopic chiral ligands (including ditopic, tritopic and tetratopic), based on the bis(oxazoline) and azabis(oxazoline) motifs, have been tested in the preparation of recoverable catalytic systems for the Henry reaction. The results obtained with the different ligands are, in general, good, but they point to the existence of a delicate balance between the coordinating ability of the ligand, the catalytic activity and the recovery of the catalyst by formation of the coordination polymer, related to the easiness to form oligomeric species in solution.
authors.affiliation: Instituto de Síntesis Química y Catálisis Homogénea (ISQCH) and Department of Organic Chemistry, Facultad de Ciencias, CSIC-Universidad de Zaragoza, C/Pedro Cerbuna, 12, E-50009 Zaragoza, Spain. jig@unizar.es.
authors.forename: Beatriz
authors.initials: B
authors.lastname: Angulo
authors.forename: José I
authors.initials: JI
authors.lastname: García
authors.forename: Clara I
authors.initials: CI
authors.lastname: Herrerías
authors.forename: José A
authors.initials: JA
authors.lastname: Mayoral
authors.forename: Ana C
authors.initials: AC
authors.lastname: Miñana