Bis(trimethylsilyl) benzamidinate zirconium dichlorides. Active catalysts for ethylene polymerization

Dorit Herskovics-Korine, Moris S. Eisen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

128 Scopus citations

Abstract

A study was made of the polymerization of ethylene involving the use of a series of [η4-4-RC6H4C(NSiMe3)2]2ZrCl2 as precatalysts (R = H (1); CH3 (2)). The benzamidinate zirconium dichloride complexes were prepared from ZrCl4 and the corresponding 4-RC6H4C(NSiMe3)2Li· TMEDA ligand. The structure of complex 1 was determined by a low-temperature X-ray diffraction study. "Cationic" ethylene polymerization catalysts were generated from 1 and 2 with methylalumoxane. The polymerization activity and the molecular weights of the polymers are strongly dependent on the catalyst and cocatalyst concentrations. The polymerization activity increases drastically with increase in pressure and temperature and decreases when electron-releasing groups are attached to the aromatic ring.

Original languageEnglish
Pages (from-to)307-314
Number of pages8
JournalJournal of Organometallic Chemistry
Volume503
Issue number2
DOIs
StatePublished - 15 Nov 1995
Externally publishedYes

Keywords

  • Benzaminidate
  • Crystal structure
  • Ziegler-Natta polymerization
  • Zirconium
  • Zirconocene

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