"Olefin Metathesis with Ruthenium-Arene Catalysts Bearing N-Heterocyclic Carbene Ligands"

Lionel Delaude and Albert Demonceau

book cover
           title: Metathesis Chemistry: From Nanostructure Design
                  to Synthesis of Advanced Materials
          series: NATO Science Series II. Mathematics, Physics and Chemistry
         editors: Yavuz Imamoglu and Valerian Dragutan
       publisher: Springer
            city: Dordrecht
            year: 2007
          volume: 243
      first page: 237
       last page: 250
            isbn: 978-1-4020-6090-8 (Print) 978-1-4020-6091-5 (Online)
             doi: 10.1007/978-1-4020-6091-5_14

Abstract: In this chapter, we summarize the main results of our investigations on the ring-opening metathesis polymerization (ROMP) of cyclooctene catalyzed by various ruthenium (Ru)-arene complexes bearing imidazolin-2-ylidene, imidazolidin-2-ylidene, or triazolin-5-ylidene ligands. Three major findings emerged from this study. First, we underscored the intervention of a photochemical activation step due to visible light illumination. Second, we established that the presence of an endocyclic double bond in the carbene ligand central heterocycle was not crucial to achieve high catalytic efficiencies. Third, we demonstrated that ortho-metallation of the N-heterocyclic carbene (NHC) ligand by the Ru center led to inactive catalysts.

Keywords: Cyclooctene, Homogeneous Catalysis, Imidazole, ortho-Metallation, Ring-Opening Metathesis Polymerization (ROMP), Triazole

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