title: Zirconium allyl complexes as participants in zirconocene-catalyzed α-olefin polymerizations.
abstract: In a search for the hitherto elusive catalyst resting state(s) of zirconocene-based olefin polymerization catalysts, a combination of UV/Vis and NMR spectrometric methods reveals that polymer-carrying cationic Zr allyl complexes make up about 90 % of the total catalyst concentration. Other catalyst species that take part in the polymerization process have to be generated from this allyl pool into which they appear to relapse rather frequently.
authors.affiliation: Boreskov Institute of Catalysis, Russian Academy of Science, Pr. Lavrentieva 5, RU 630090 Novosibirsk (Russian Federation). dimi@catalysis.ru.
authors.forename: Dmitrii E
authors.initials: DE
authors.lastname: Babushkin
authors.forename: Valentina N
authors.initials: VN
authors.lastname: Panchenko
authors.forename: Hans-Herbert
authors.initials: HH
authors.lastname: Brintzinger
keywords: allyl complexes; ansa-zirconocenes; olefin polymerization; polymerization catalysis; resting states