title: Polymerization of norbornene using chiral bis(phenolate) zirconium catalysts.
abstract: Norbornene is polymerized by employing zirconium catalysts with (OSSO)-type bis(phenolate) ligands. The racemic precatalyst rac-1 produces high molecular weight poly(norbornene) with slight optical activity. Enantiopure precatalysts (S,S)-1 and (R,R)-1 are used to study the optical induction in the poly(norbornene)s formed. To overcome the insolubility of poly(norbornene)s in common solvents, their microstructure is studied using copolymers with ethylene as well as hydrooligomers. The crystal structure of a norbornene tetramer is reported.
authors.affiliation: RWTH Aachen University, Institute of Inorganic Chemistry, Landoltweg 1, 52056, Aachen, Germany.
authors.forename: Marie
authors.initials: M
authors.lastname: Tschage
authors.forename: Seungwhan
authors.initials: S
authors.lastname: Jung
authors.forename: Thomas P
authors.initials: TP
authors.lastname: Spaniol
authors.forename: Jun
authors.initials: J
authors.lastname: Okuda
mesh_terms: D002384:Catalysis; D019281:Dimerization; D005030:Ethylenes / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D015394:Molecular Structure; D009636:Norbornanes / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry*; D058105:Polymerization; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D012995:Solubility; D012997:Solvents / Q000737:chemistry; D013237:Stereoisomerism; D015040:Zirconium / Q000737:chemistry*
chemical_list: D005030:Ethylenes; D009636:Norbornanes; D009942:Organometallic Compounds; D010636:Phenols; D011108:Polymers; D012997:Solvents; C036216:ethylene; D015040:Zirconium
keywords: crystalline oligo(norbornene); ethylene-norbornene copolymers; non-metallocene catalysts; norbornene polymerization; optically active polymers