Ethylene trimerization with Cr-PNP and Cr-SNS complexes: Effect of ligand structure, metal oxidation state, and role of activator on catalysis

David S. McGuinness; David B. Brown; Robert P. Tooze; Fiona M. Hess; John T. Dixon; Alexandra M. Z. Slawin

doi:10.1021/om0601091

Ethylene trimerization with Cr-PNP and Cr-SNS complexes: Effect of ligand structure, metal oxidation state, and role of activator on catalysis

David S. McGuinness, David B. Brown, Robert P. Tooze, Fiona M. Hess, John T. Dixon, Alexandra M. Z. Slawin

Research output: Contribution to journal › Article › peer-review

Abstract

Selected PNP and SNS ethylene trimerization ligands have been coordinated to Cr-II and Cr-III, and further reactions of these complexes have been studied. The ligands are easily deprotonated to afford monoanionic tridentate ligands. All prepared complexes gave ethylene trimerization catalysis with varying degrees of activity upon activation with both MAO and AlR3/B(C6F5)(3). The results of this study show that the role of MAO during activation is one of deprotonation, Cr reduction, and cation generation. A Cr-II -> Cr-IV cationic mechanism is suggested.

Original language	English
Pages (from-to)	3605-3610
Number of pages	6
Journal	Organometallics
Volume	25
DOIs	https://doi.org/10.1021/om0601091
Publication status	Published - 17 Jul 2006

Keywords

CHROMIUM(II) COMPLEXES
ETHENE TRIMERIZATION
MECHANISM
TETRAMERIZATION
POLYMERIZATION
SELECTIVITY
1-HEXENE
ORIGIN
SYSTEM
ALR3

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title = "Ethylene trimerization with Cr-PNP and Cr-SNS complexes: Effect of ligand structure, metal oxidation state, and role of activator on catalysis",

abstract = "Selected PNP and SNS ethylene trimerization ligands have been coordinated to Cr-II and Cr-III, and further reactions of these complexes have been studied. The ligands are easily deprotonated to afford monoanionic tridentate ligands. All prepared complexes gave ethylene trimerization catalysis with varying degrees of activity upon activation with both MAO and AlR3/B(C6F5)(3). The results of this study show that the role of MAO during activation is one of deprotonation, Cr reduction, and cation generation. A Cr-II -> Cr-IV cationic mechanism is suggested.",

keywords = "CHROMIUM(II) COMPLEXES, ETHENE TRIMERIZATION, MECHANISM, TETRAMERIZATION, POLYMERIZATION, SELECTIVITY, 1-HEXENE, ORIGIN, SYSTEM, ALR3",

author = "McGuinness, {David S.} and Brown, {David B.} and Tooze, {Robert P.} and Hess, {Fiona M.} and Dixon, {John T.} and Slawin, {Alexandra M. Z.}",

year = "2006",

month = jul,

day = "17",

doi = "10.1021/om0601091",

language = "English",

volume = "25",

pages = "3605--3610",

journal = "Organometallics",

issn = "0276-7333",

publisher = "American Chemical Society (ACS)",

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TY - JOUR

T1 - Ethylene trimerization with Cr-PNP and Cr-SNS complexes: Effect of ligand structure, metal oxidation state, and role of activator on catalysis

AU - McGuinness, David S.

AU - Brown, David B.

AU - Tooze, Robert P.

AU - Hess, Fiona M.

AU - Dixon, John T.

AU - Slawin, Alexandra M. Z.

PY - 2006/7/17

Y1 - 2006/7/17

N2 - Selected PNP and SNS ethylene trimerization ligands have been coordinated to Cr-II and Cr-III, and further reactions of these complexes have been studied. The ligands are easily deprotonated to afford monoanionic tridentate ligands. All prepared complexes gave ethylene trimerization catalysis with varying degrees of activity upon activation with both MAO and AlR3/B(C6F5)(3). The results of this study show that the role of MAO during activation is one of deprotonation, Cr reduction, and cation generation. A Cr-II -> Cr-IV cationic mechanism is suggested.

AB - Selected PNP and SNS ethylene trimerization ligands have been coordinated to Cr-II and Cr-III, and further reactions of these complexes have been studied. The ligands are easily deprotonated to afford monoanionic tridentate ligands. All prepared complexes gave ethylene trimerization catalysis with varying degrees of activity upon activation with both MAO and AlR3/B(C6F5)(3). The results of this study show that the role of MAO during activation is one of deprotonation, Cr reduction, and cation generation. A Cr-II -> Cr-IV cationic mechanism is suggested.

KW - CHROMIUM(II) COMPLEXES

KW - ETHENE TRIMERIZATION

KW - MECHANISM

KW - TETRAMERIZATION

KW - POLYMERIZATION

KW - SELECTIVITY

KW - 1-HEXENE

KW - ORIGIN

KW - SYSTEM

KW - ALR3

UR - http://www.scopus.com/inward/record.url?scp=33746352372&partnerID=8YFLogxK

U2 - 10.1021/om0601091

DO - 10.1021/om0601091

M3 - Article

SN - 0276-7333

VL - 25

SP - 3605

EP - 3610

JO - Organometallics

JF - Organometallics

ER -

Ethylene trimerization with Cr-PNP and Cr-SNS complexes: Effect of ligand structure, metal oxidation state, and role of activator on catalysis

Abstract

Keywords

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