N,N-Diphospholylamines-A New Family of Ligands for Highly Active, Chromium-Based, Selective Ethene Oligomerisation Catalysts

Thomas E Stennett, Thomas W Hey, Liam T Ball, Stephanie R Flynn, James E Radcliffe, Claire L McMullin, Richard L Wingad, Duncan F Wass

Research output: Contribution to journalArticle (Academic Journal)peer-review

25 Citations (Scopus)

Abstract

A series of new diphosphazane (PNP) ligands that contain 2,3,4,5-tetraethylphosphole or dibenzophosphole moieties has been synthesised. The new compounds have been screened for chromium-catalysed, selective ethene oligomerisation by insitu combination with CrCl3(thf)(3) and methylaluminoxane (MAO). The ligands derived from 2,3,4,5-tetraethylphosphole produce highly active catalysts for ethene oligomerisation, which show excellent selectivity to C-6 and C-8 linear -olefins. Complexes of the form [Cr(CO)(4)L] were synthesised and studied by IR spectroscopy and single-crystal XRD. Variable-temperature NMR spectroscopy was used to investigate restricted PN rotation in compounds with bulky nitrogen substituents.

Original languageEnglish
Pages (from-to)2946-2954
Number of pages9
JournalChemCatChem
Volume5
Issue number10
DOIs
Publication statusPublished - Oct 2013

Structured keywords

  • BCS and TECS CDTs

Keywords

  • chromium
  • oligomerization
  • homogeneous catalysis
  • P ligands
  • NMR spectroscopy
  • ETHYLENE TETRAMERIZATION
  • MECHANISTIC INVESTIGATIONS
  • TRIMERIZATION
  • COMPLEXES
  • DIPHOSPHINOAMINES
  • DIMERIZATION
  • PHOSPHOLES
  • 1-HEXENE
  • 1-BUTENE
  • DENSITY

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