Issue 20, 2015

Highly active chromium-based selective ethylene tri-/tetramerization catalysts supported by PNPO phosphazane ligands

Abstract

Novel Cr(III) catalysts supported by PNPO phosphazane ligands of the type Ph2PN(R)P(Ph)OAr have been prepared, all of which, upon activation with MMAO-3A, are highly active in ethylene tri-/tetramerization with considerable selectivity. The effect of ligand substitution on the catalytic performance has been examined. The Cr precatalyst supported by the PNPO phosphazane ligand with an N-cyclohexyl achieved high activity of 316.7 kg (g Cr h−1)−1 and a high total selectivity of 85.1% towards valuable 1-hexene (45.7%) and 1-octene (39.4%) using chlorobenzene as the solvent at 35 bar and 40 °C. In methylcyclohexane, the precatalyst supported by [Ph2PN(iPr)P(Ph)OPh] exhibited a higher 1-octene selectivity (54.0%) with a considerable activity of 73.3 kg (g Cr h−1)−1 at 35 bar and 40 °C. With the fine-tuned ligand backbone, such a PNPO phosphazane-based catalyst system provides a mode for precise understanding of the impact of ligand variations on catalytic performance.

Graphical abstract: Highly active chromium-based selective ethylene tri-/tetramerization catalysts supported by PNPO phosphazane ligands

Supplementary files

Article information

Article type
Paper
Submitted
24 Feb 2015
Accepted
09 Apr 2015
First published
28 Apr 2015

Dalton Trans., 2015,44, 9545-9550

Highly active chromium-based selective ethylene tri-/tetramerization catalysts supported by PNPO phosphazane ligands

Y. Zhou, H. Wu, S. Xu, X. Zhang, M. Shi and J. Zhang, Dalton Trans., 2015, 44, 9545 DOI: 10.1039/C5DT00801H

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