Abstract
The zirconium benzamidinate dimethyl complex [PhC(NSiMe3) 2]2Zr(Me)2 (1) was activated by a mixture of trityl tetrakispentafluorophenylborate (TTPB) and a small amount of methylalumoxane (MAO) (Zr:B:Al = 1:1:50), forming an extremely active catalytic system for the polymerization of olefins, producing high-density polyethylene and elastomeric polypropylene with a narrow MWD. This catalytic system rivals the activity of the best nonmetallocene systems and approaches the activities of the best metallocene complexes. Single active sites are obtained only after the addition of propylene. A plausible activation mechanism is proposed, which is corroborated by NMR, ESR spectroscopy, radical trapping on fullerene, and MALDI-TOF mass spectroscopy experiments.
Original language | English |
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Pages (from-to) | 2722-2724 |
Number of pages | 3 |
Journal | Organometallics |
Volume | 25 |
Issue number | 11 |
DOIs | |
State | Published - 22 May 2006 |
Externally published | Yes |