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Chiral Chromium Salen@rGO as Multipurpose and Recyclable Heterogeneous Catalyst |
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| Authors: | Mariam Abd El Sater Dr Mohamed Mellah Dr Diana Dragoe Emilie Kolodziej Dr Nada Jaber Dr Emmanuelle Schulz |
| Institution: | 1. Equipe de Catalyse Moléculaire, Université Paris Saclay, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Bâtiment 420, 91405 Orsay Cedex, France
Laboratoire de Chimie Médicinale et des Produits Naturels, Université Libanaise, Faculté des Sciences (I) et PRASE-EDST, postcode is missing Hadath, Beyrouth, Lebanon;2. Equipe de Catalyse Moléculaire, Université Paris Saclay, Institut de Chimie Moléculaire et des Matériaux d'Orsay, Bâtiment 420, 91405 Orsay Cedex, France;3. Laboratoire de Chimie Médicinale et des Produits Naturels, Université Libanaise, Faculté des Sciences (I) et PRASE-EDST, postcode is missing Hadath, Beyrouth, Lebanon |
| Abstract: | The first immobilization of a pyrene-tagged chromium salen complex through π-π noncovalent interactions on reduced graphene oxide (rGO) is described. A very robust supported catalytic system is obtained to promote asymmetric catalysis in repeated cycles, without loss of activity or enantioselectivity. This specific behavior was demonstrated in two different catalytic reactions (up to ten reuses) promoted by chromium salen complexes, the cyclohexene oxide ring-opening reaction and the hetero-Diels-Alder cycloaddition between various aldehydes and Danishefsky's diene. Furthermore, the chiral chromium salen@rGO has been found to be compatible with a multi-substrate type use, in which the structure of the substrate involved is modified each time the catalyst is reused. |
| Keywords: | asymmetric catalysis Cr-salen complexes recycling reduced graphene oxide supported catalysts |