Group 4 complexes of chelating dianionic [OSO] binaphtholate ligands; Synthesis and alkene polymerisation catalysis

L S Natrajan, C Wilson, J Okuda, P L Arnold, Polly Arnold

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Abstract

Mono- and bis(ligand)titanium and -zirconium complexes of a sulfur-bridged binaphtholate [1,1'-S(2-HOC10H4-tBu(2)-3,6)(2)] (H2LSN) have been synthesised and characterised. Complexes of the general form [M(L-SN)X-2] (X Cl, CH2Ph) are prepared by protonolysis or metathesis. X-ray crystallographic structural characterisation of the dibenzyl complex [Zr(L-SN) (CH2Ph)(2)] is reported, as well as the structure of its partially oxidised derivative [Zr(L-SN) (CH2Ph)(OCH2Ph)](2). Complexes of the form [M(L-SN)(2)] are readily formed; these can be converted by comproportionation reactions into the mono-L-SN derivatives above. The X-ray crystal structure of a bis (sulfur-bridged biphenolate) is presented. The representative complexes have been tested as alkene polymerisation catalysts, in conjunction with a methylalumoxane cocatalyst, and for the first time a zirconium complex of a sulfur-bridged biphenolate-type ligand has been found to be active in the polymerisation of ethene. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004).

Original languageEnglish
Pages (from-to)3724-3732
Number of pages9
JournalEuropean journal of inorganic chemistry
Issue number18
DOIs
Publication statusPublished - 20 Sep 2004

Keywords

  • binaphthol ligands
  • polymerisation catalysis
  • organometallic
  • group 4 elements
  • zirconium
  • titanium
  • BRIDGED BIS(PHENOLATO) LIGAND
  • NAPHTHALENE PERI POSITIONS
  • 4-CENTER 6-ELECTRON BOND
  • TITANIUM COMPLEXES
  • OLEFIN POLYMERIZATION
  • MOLECULAR-STRUCTURE
  • TRANSITION-METALS
  • STRUCTURAL-CHARACTERIZATION
  • DIARYLOXO LIGANDS
  • LINEAR ALIGNMENT

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