From alternating to selective distributions in chromium-catalysed ethylene oligomerisation with asymmetric BIMA ligands

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Title: From alternating to selective distributions in chromium-catalysed ethylene oligomerisation with asymmetric BIMA ligands
Authors: Nobbs, JD
Tomov, AK
Young, CT
White, AJP
Britovsek, GJP
Item Type: Journal Article
Abstract: The oligomerisation of ethylene with chromium-based catalysts containing asymmetric BIMA (bis(benzimidazole)methylamine) ligands produces linear alpha olefins (LAOs) that follow an alternating distribution. The catalytic activity and the degree of alternation is affected by the different ligands; in particular variations at the backbone of the ligand affect the nature of the distribution. For certain catalysts a deviation from regular alternating behaviour is observed, whereby increased amounts of 1-hexene and 1-octene (up to 29 mol%) are obtained compared to the amount expected from the distribution analysis based on C₁₀–C₃₄ LAOs. This behaviour towards more selective oligomerisation to 1-hexene and 1-octene can be explained by varying probabilities of single and double ethylene insertion. The deviations will depend on the size of the metallacycle and are most pronounced early on during the metallacycle growth.
Issue Date: 29-Jan-2018
Date of Acceptance: 26-Jan-2018
URI: http://hdl.handle.net/10044/1/58249
DOI: https://dx.doi.org/10.1039/c7cy01896g
ISSN: 2044-4753
Publisher: Royal Society of Chemistry
Start Page: 1314
End Page: 1321
Journal / Book Title: Catalysis Science and Technology
Volume: 8
Issue: 5
Copyright Statement: © The Royal Society of Chemistry 2018
Sponsor/Funder: INEOS Technologies France SAS
Funder's Grant Number: N/A
Keywords: Science & Technology
Physical Sciences
Chemistry, Physical
Chemistry
LINEAR ALPHA-OLEFINS
METAL-COMPLEXES
MECHANISM
DIMERIZATION
TETRAMERIZATION
TI(OR')(4)/ALR3
POLYMERIZATION
1-OCTENE
SINGLE
Publication Status: Published
Appears in Collections:Chemistry
Catalysis and Advanced Materials
Faculty of Natural Sciences



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