Cycloalkyl-based unsymmetrical unsaturated (U2)-NHC ligands : flexibility and dissymmetry in ruthenium-catalysed olefin metathesis.

Abstract : Air-stable Ru-indenylidene and Hoveyda-type complexes bearing new unsymmetrical unsaturated N-heterocyclic carbene (U2-NHC) ligands combining a mesityl unit and a flexible cycloalkyl moiety as N-substituents were synthesised. Structural features, chemical stabilities and catalytic profiles in olefin metathesis of this new library of cycloalkyl-based U2-NHC Ru complexes were studied and compared with their unsymmetrical saturated NHC-Ru homologues as well as a set of commercially available Ru-catalysts bearing either symmetrical SIMes or IMes NHC ligands.
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Mathieu Rouen, Etienne Borré, Laura Faliverne, Loic Toupet, Mickaël Berthod, et al.. Cycloalkyl-based unsymmetrical unsaturated (U2)-NHC ligands : flexibility and dissymmetry in ruthenium-catalysed olefin metathesis.. Dalton Transactions, Royal Society of Chemistry, 2014, 43 (19), pp.7044-7049. ⟨10.1039/c4dt00142g⟩. ⟨hal-01068360⟩

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