Issue 5, 2018

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

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
15 Sep 2017
Accepted
26 Jan 2018
First published
29 Jan 2018

Catal. Sci. Technol., 2018,8, 1314-1321

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

J. D. Nobbs, A. K. Tomov, C. T. Young, A. J. P. White and G. J. P. Britovsek, Catal. Sci. Technol., 2018, 8, 1314 DOI: 10.1039/C7CY01896G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements