Ana Rosa Silva
Aveiro University, Portugal
Title: Asymmetric heterogeneous catalysts based on copper(II) complexes with bis(oxazoline) ligands
Biography
Biography: Ana Rosa Silva
Abstract
Catalysis is a source of atom economic and low costtechnologies. It is therefore one of the pillars of green chemistry. Asymmetric catalysis is unique in the sense that a minute quantity of chiral catalyst is sufficient to generate large amounts of enantiopure compounds. Bis (oxazoline)ligands are one of the very versatile chiral ligands systems used in asymmetric catalysis.A large number of organic transformations have been enantio selectively catalyzed by their transition metal complexes. Among other asymmetric organic transformations, the copper (II) complexes are very efficient in the cyclopropanation and aziridination of alkenes and in the kinetic resolution of 1, 2-diols. These ligands are commercially available, but are expensive. Therefore there has been an intense research effort to make them recyclable and reusable, thus economical. The most used strategy has been the covalent immobilization onto several supports with varying degree of success depending on the type of porous support and immobilization methodology. In this presentation the importance of the support properties in the stability and performance of immobilized copper (II) bis (oxazoline) complexes in asymmetric catalysis will be shown.
