PNPN-H in Comparison to other PNP, PNPN and NPNPN Ligands for the Chromium Catalyzed Selective Ethylene Oligomerization

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Date
2019
Volume
12
Issue
1
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Publisher
Weinheim : Wiley-VCH Verlag
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Abstract

Many examples exist for the chromium catalyzed selective ethylene oligomerization in which the influence of ligands is essential for the formation of products. Regarding the tri- and tetramerization to 1-hexene or 1-octene mostly PNP ligands are responsible for the tetra- and some of such modified ligands for the trimerization. A very special case in these reactions are PNPN−H ligands, showing in most cases highly selective trimerization of ethylene to 1-hexene. In this review all existing published information about these PNPN−H ligands is accumulated and compared to some other related PNP, PNPN and NPNPN ligands in the chromium catalyzed selective ethylene oligomerization with respect to the switch from tetra- to trimerization and back by different substituent pattern of PNP ligand. Mechanistic information and arguments are collected to explain the switch from tetra- to trimerization and back by substitution of functional groups in classical PNP to PNPN−H ligands as a result of mono- and dinuclear catalytic species. © 2019 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

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Keywords
homogeneous catalysis, mechanism, organometallic chemistry, phosphorus ligands, selective oligomerization
Citation
Rosenthal, U. (2019). PNPN-H in Comparison to other PNP, PNPN and NPNPN Ligands for the Chromium Catalyzed Selective Ethylene Oligomerization. 12(1). https://doi.org//10.1002/cctc.201902111
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CC BY-NC-ND 4.0 Unported