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Phosphanyl methanimine (PCN) ligands for the selective trimerization/tetramerization of ethylene with chromium.

Radcliffe, James E. and Batsanov, Andrei S. and Smith, David M. and Scott, John A. and Dyer, Philip W. and Hanton, Martin J. (2015) 'Phosphanyl methanimine (PCN) ligands for the selective trimerization/tetramerization of ethylene with chromium.', ACS catalysis., 5 (12). pp. 7095-7098.


1-Phosphanyl methanimine ligands, R2P–C(Ph)═NR′, may be prepared via a modular, convergent synthesis in good overall yield. Coordination chemistry studies with chromium confirm that they bind in a bidentate κ2-P,N mode. In combination with chromium and an activator, these ligands promote the selective oligomerization of ethylene to 1-hexene and 1-octene with high activity. Notably, an exceptionally high liquid fraction selectivity to saleable products (1-hexene + 1-octene) is observed (>95%), along with a potent ligand dependence, such that selectivity can be varied from pure trimerization through to mixed trimerisation/tetramerisation with a 1-octene:1-hexene (OTH) ratio of 1.7.

Item Type:Article
Keywords:Oligomerization, Trimerization, Tetramerization, Ethylene, Catalysis, α-olefins, Chromium, P,N-ligands.
Full text:(AM) Accepted Manuscript
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Publisher statement:This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Catalysis, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Date accepted:30 October 2015
Date deposited:09 November 2015
Date of first online publication:02 November 2015
Date first made open access:30 October 2016

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