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Ethylene oligomerisation chromium catalysts with unsymmetrical PCNP ligands

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journal contribution
posted on 12.05.2021, 08:08 by Kevin Blann, Annette Bollmann, Gavin Brown, John T Dixon, Mark Elsegood, Christopher R Raw, Martin Smith, Kenny Tenza, J Alexander Willemse, Pumza Zweni

Chromium(III) complexes of chelating diphosphines, with PNP or PCNCP backbones, are excellent catalysts for ethylene tetra- and/or trimerisations. A missing link within this ligand series are unsymmetric chelating diphosphines based on a PCNP scaffold. New bidentate PCNP ligands of the type Ph2PCH2N(R)PPh2 (R = 1-naphthyl or 5-quinoline groups, 2a–d) have been synthesised and shown to be extremely effective ligands for ethylene tri-/tetramerisations. Three representative tetracarbonyl Cr0 complexes bearing a single PN(R)P (5), PCN(R)P (6), or PCN(R)CP (7) diphosphine (R = 1-naphthyl) have been prepared from Cr(CO)44-nbd) (nbd = norbornadiene). Furthermore we report a single crystal X-ray diffraction study of these compounds and discuss their structural parameters.

Funding

EPSRC

Sasol Technology (Pty) Ltd

Loughborough University

History

School

  • Science

Department

  • Chemistry

Published in

Dalton Transactions

Volume

50

Issue

12

Pages

4345 - 4354

Publisher

Royal Society of Chemistry (RSC)

Version

VoR (Version of Record)

Rights holder

Journal is © The Royal Society of Chemistry

Publisher statement

This is an Open Access Article. It is published by the Royal Society of Chemistry under the Creative Commons Attribution 3.0 Unported Licence (CC BY 3.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/3.0/

Acceptance date

02/03/2021

Publication date

2021-03-10

Copyright date

2021

ISSN

1477-9226

eISSN

1477-9234

Language

en

Depositor

Dr Martin Smith. Deposit date: 11 May 2021