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  • Ruthenium Olefin Metathesis Catalysts Bearing a Macrocyclic N‐Heterocyclic Carbene Ligand: Enhanced Stability and Activity

    • Ruthenium Olefin Metathesis Catalysts Bearing a Macrocyclic N‐Heterocyclic Carbene Ligand: Enhanced Stability and Activity

    Title Ruthenium Olefin Metathesis Catalysts Bearing a Macrocyclic N‐Heterocyclic Carbene Ligand: Enhanced Stability and Activity
    Authors Wioletta Kośnik, Dawid Lichosyt, Marcin Śnieżek, Angelika Janaszkiewicz, Krzysztof Woźniak, Maura Malińska, Bartosz Trzaskowski, Anna Kajetanowicz, Karol Grela
    Magazine Angewandte Chemie (International Ed. in English)
    Date 04/13/2022
    DOI 10.1002/anie.202201472
    Introduction Creating sterically hindered C−C double bonds through catalytic olefin metathesis presents a significant challenge for ruthenium catalysts. To address this, specialised catalysts with sterically reduced N‐heterocyclic carbene (NHC) ligands have been developed. These catalysts are highly active but less stable than general-purpose catalysts. To enhance stability, a new NHC ligand was designed, featuring a macrocyclic structure with two sterically reduced aryl arms connected by a C‐8 alkyl chain. Integrating this ligand into the ruthenium centre resulted in a catalyst (trans‐Ru6) that can transform into an isomer with two Cl ligands in a cis‐arrangement (cis‐Ru6). Both complexes show high thermodynamic stability but have varied catalytic application profiles.
    Quote Wioletta Kośnik, Dawid Lichosyt and Marcin Śnieżek et al. Ruthenium Olefin Metathesis Catalysts Bearing a Macrocyclic N‐Heterocyclic Carbene Ligand: Improved Stability and Activity. Angew. Chem. Int. Ed. Engl. 2022. DOI: 10.1002/anie.202201472
    Element Ruthenium (Ru)
    Materials Chemical Compounds
    Industry Chemical & Pharmacy
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