Titanacalixarenes in homogeneous catalysis: Synthesis, conformation and catalytic activity in ethylene polymerisation

Jeff Espinas, Ulrich Darbost, Jeremie Pelletier, Erwan Jeanneau, Christian Duchamp, François Bayard, Olivier Boyron, Jean Pierre Broyer, Jean Thivolle-Cazat, Jean-Marie Maurice Basset, Mostafa Taoufik*, Isabelle Bonnamour

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Variously substituted titanacalixarenes were synthesised and tested for their performance as catalysts in ethylene polymerisation: p-tert-butylcalix[4] arene was derivatised to afford distal diether p-tert-butylcalix[4]arenes L1-L4, distal dihydroxy-depleted L5, proximal dihydroxy-depleted L6, proximal diether p-tert-butylcalix[4]arene L7, proximal intra-bridged disiloxane L8 and proximal monoether L9. (Dichlorotitana)-p-tert-butylcalix[4]arenes 1-8 and (monochlorotitana)-p-tertbutylcalix[4]arene 9 have been successfully synthesised by reacting L1-L4 with TiCl4·2THF or L5-L9 with TiCl 4. The structural conformation of complexes 1-9 in solution were determined by 1H NMR, 13C NMR, NOESY and COSY spectroscopic studies. Compounds 2, 3 and 4 have been structurally characterised by single-crystal X-ray diffraction. Upon activation with methylaluminoxane, compounds 1-8 revealed low to moderate activities for the production of high-density polyethylene (HDPE) to ultra-high-molecular-weight polyethylene (UHMWPE). 6/MAO gave the best activity at 770 kgPE(molTi) -1h-1.

Original languageEnglish (US)
Pages (from-to)1349-1359
Number of pages11
JournalEuropean Journal of Inorganic Chemistry
Issue number9
DOIs
StatePublished - Jan 1 2010

Keywords

  • Calixarenes
  • Ethylene
  • Homogeneous catalysis
  • Polymerization
  • Titanium

ASJC Scopus subject areas

  • Inorganic Chemistry

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