Ethylene oligomerisation chromium catalysts with unsymmetrical PCNP ligands
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)4(η4-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 TransactionsVolume
50Issue
12Pages
4345 - 4354Publisher
Royal Society of Chemistry (RSC)Version
- VoR (Version of Record)
Rights holder
Journal is © The Royal Society of ChemistryPublisher 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
2021-03-02Publication date
2021-03-10Copyright date
2021ISSN
1477-9226eISSN
1477-9234Publisher version
Language
- en