title: Exploring the Reactivity of Na[W2(μ-Cl)3Cl4(THF)2]∙(THF)3 towards the Polymerization of Selected Cycloolefins.
abstract: The bimetallic compound Na[W2(μ-Cl)3Cl4(THF)2]·(THF)₃ (1, {W (3) W}(6+), a'2e'4) is a highly efficient room-temperature initiator for ring opening metathesis polymerization (ROMP) of norbornene (NBE) and some of its derivatives. In most cases, addition of phenylacetylene (PA) as co-initiator improves the catalytic activity and retains the high cis-stereoselectivity. On the other hand, 1 can polymerize cyclopentadiene (CPD), not via a metathetic, but rather, via a cationic mechanism. Here, we present a comparison of the reactivity of the two catalytic systems (1 and 1/PA) between themselves and with other systems reported in the literature, the characterization of the polymers formed and mechanistic aspects of the corresponding reactions.
authors.affiliation: Department of Inorganic Chemistry, Faculty of Chemistry, University of Athens, Panepistimiopolis Zografou, Athens 15771, Greece. nsaragas@sch.gr.
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Saragas
authors.affiliation: Department of Inorganic Chemistry, Faculty of Chemistry, University of Athens, Panepistimiopolis Zografou, Athens 15771, Greece. geofloros@chem.uoa.gr.
authors.forename: Georgios
authors.initials: G
authors.lastname: Floros
authors.affiliation: Department of Inorganic Chemistry, Faculty of Chemistry, University of Athens, Panepistimiopolis Zografou, Athens 15771, Greece. grigorisrap@chem.uoa.gr.
authors.forename: Grigorios
authors.initials: G
authors.lastname: Raptopoulos
authors.affiliation: Department of Industrial Chemistry, Faculty of Chemistry, University of Athens, Panepistimiopolis Zografou, Athens 15771, Greece. pitsikalis@chem.uoa.gr.
authors.forename: Marinos
authors.initials: M
authors.lastname: Pitsikalis
authors.affiliation: Department of Inorganic Chemistry, Faculty of Chemistry, University of Athens, Panepistimiopolis Zografou, Athens 15771, Greece. paraskevopoulou@chem.uoa.gr.
authors.forename: Patrina
authors.initials: P
authors.lastname: Paraskevopoulou
authors.affiliation: Department of Inorganic Chemistry, Faculty of Chemistry, University of Athens, Panepistimiopolis Zografou, Athens 15771, Greece. cmertis@chem.uoa.gr.
authors.forename: Konstantinos
authors.initials: K
authors.lastname: Mertis
mesh_terms: D000812:Anhydrides / Q000737:chemistry*; D002384:Catalysis; D056831:Coordination Complexes / Q000737:chemistry*; D018360:Crystallography, X-Ray; D003516:Cycloparaffins / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D009636:Norbornanes / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D058105:Polymerization; D011108:Polymers / Q000737:chemistry*
chemical_list: D000812:Anhydrides; D056831:Coordination Complexes; D003516:Cycloparaffins; D009636:Norbornanes; D009942:Organometallic Compounds; D011108:Polymers; C085227:norbornene anhydride
keywords: ROMP; metal-metal bonds; metathesis; tungsten