A versatile and highly Z -Selective olefin metathesis ruthenium catalyst based on a readily accessible N -heterocyclic carbene
Résumé
A ruthenium catalyst for Z-selective olefin metathesis has been synthesized from a readily accessible N-heterocyclic carbene (NHC) ligand that is prepared using an efficient, practical, and scalable multicomponent synthesis. The desired ruthenium complex with cyclometalated NHC ligand is obtained by means of selective C(sp3)-H activation at the adamantyl fragment and X-ray diffraction analysis unambiguously confirmed the structure of the precatalyst. The catalyst demonstrated attractive catalytic performance in self- and cross-metathesis at low catalyst loading to afford the desired internal olefins with high conversion and very high Z-selectivity (up to andgt;99%). The versatility of the chelated catalyst is illustrated by the high cis-selectivity (up to andgt;98%) and high tacticity control (up to andgt;98% syndiotactic) achieved in ring-opening polymerization, allowing for the production of highly microstructurally controlled norbornene-, norbornadiene-, and cyclopropene-derived polymers.
Mots clés
Z-selective catalyst
Ruthenium catalysts
Olefin metathesis
N-heterocyclic carbenes
N-heterocyclic carbene ligands
Ruthenium complexes
Catalyst selectivity
Activation analysis
Chelation
Ligands
Olefins
Ring opening polymerization
Ruthenium compounds
Synthesis (chemical)
X ray diffraction analysis
Catalyst loadings
Catalytic performance
Multicomponent synthesis
Syndiotactic polymers
NHC ligand
Fichier principal
Dumas et al_2018_A Versatile and Highly Z-Selective Olefin Metathesis Ruthenium Catalyst Based.pdf (654.82 Ko)
Télécharger le fichier
Origine | Fichiers produits par l'(les) auteur(s) |
---|
Loading...