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- Title
Stereoselective Ring-Opening Metathesis Polymerization of 7- tert-Butoxy-bicyclo[2,2,1]hepta-2,5-diene by NHC-Ruthenium Catalysts.
- Authors
Mariconda, Annaluisa; Grisi, Fabia; Granito, Alberto; Longo, Pasquale
- Abstract
Ru complexes having N-heterocyclic carbene (NHC) ligands, differing in the bulkiness of N-aryl substituents and in the backbone substitution and/or configuration, are utilized in the ring-opening metathesis polymerization (ROMP) of 7- tert-butoxybicyclo[2,2,1]hepta-2,5-diene (7-TBONBD). The activity, regioselectivity, and stereoselectivity of the catalysts are investigated and rationalized considering the influence of the NHC ligand architectures of Ru complexes on the outcome of the polymerization. The reactivity order is influenced by bulky substituents at the nitrogen of the NHC ligand and by NHC-backbone substitution. All of the catalysts give rise to living polymerizations and show high selectivity, producing highly syndiotactic polymers with 100% of anti-units and, surprisingly, an elevated cis-content (up to 88%).
- Subjects
STEREOSELECTIVE reactions; RING-opening polymerization; METATHESIS reactions; RUTHENIUM catalysts; HETEROCYCLIC chemistry
- Publication
Macromolecular Chemistry & Physics, 2013, Vol 214, Issue 17, p1973
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201300069