Issue 12, 2021

Ethylene oligomerisation chromium catalysts with unsymmetrical PCNP ligands

Abstract

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.

Graphical abstract: Ethylene oligomerisation chromium catalysts with unsymmetrical PCNP ligands

Supplementary files

Article information

Article type
Paper
Submitted
27 Jan 2021
Accepted
02 Mar 2021
First published
10 Mar 2021
This article is Open Access
Creative Commons BY license

Dalton Trans., 2021,50, 4345-4354

Ethylene oligomerisation chromium catalysts with unsymmetrical PCNP ligands

K. Blann, A. Bollmann, G. M. Brown, J. T. Dixon, M. R. J. Elsegood, C. R. Raw, M. B. Smith, K. Tenza, J. A. Willemse and P. Zweni, Dalton Trans., 2021, 50, 4345 DOI: 10.1039/D1DT00287B

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