Synthesis, characterization and reactivity of amido titanium and zirconium complexes

Helmut Mack, Moris S. Eisen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

The polymerization of ethylene and propylene was studied by using a series of mono-and spirocyclic coordinatively unsaturated early transition metal amides as pre-catalysts. Amido complexes were prepared either by metathesis reaction of Cp2ZrCl2 and the dilithium salt of the bisamido ligand (Me3SiN-(CH2)2-NSiMe3)2-, by transamination reaction of Zr(NMe2)4 with two equivalents of the diamine ligand (Me3SiNH-(CH2)2-NHSiMe3), and by metathesis reaction of ZrCl4 • 2THF or TiCl4 with equimolar amounts of the dilithium salt (Me3SiN-(CH2)2-NSiMe3)2-. The complexes obtained were characterized by standard spectroscopic techniques. 'Cationic' polymerization catalysts were generated from the early transition-metal amides with methylalumoxane. Polymerization activity is dependent on catalyst and co-catalyst concentrations.

Original languageEnglish
Pages (from-to)81-87
Number of pages7
JournalJournal of Organometallic Chemistry
Volume525
Issue number1-2
DOIs
StatePublished - 15 Nov 1996
Externally publishedYes

Keywords

  • Group 4
  • Metallocenes
  • Polymerization
  • Titanium
  • Zirconium
  • α-olefins

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