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