Bis(imino)pyridine iron(II) alkyl cations for olefin polymerization

Marco W. Bouwkamp; Emil Lobkovsky; Paul J. Chirik

doi:10.1021/ja0524447

Bis(imino)pyridine iron(II) alkyl cations for olefin polymerization

Marco W. Bouwkamp, Emil Lobkovsky, Paul J. Chirik

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150 Scopus citations

Abstract

Treatment of the five-coordinate ferrous dialkyl complex, (ⁱPrPDI)Fe(CH₂SiMe₃)₂ (ⁱPrPDI = ((2,6-CHMe₂)₂C₆H₃N=CMe)₂C₅H₃N), with [PhMe₂NH][BPh₄] in the presence of diethyl ether or tetrahydrofuran furnished the corresponding alkyl cations, where the donor ligand is coordinated in the basal plane of a distorted square pyramidal iron(II) alkyl cation. Performing the same reaction with the neutral Lewis acid, B(C₆F₅)₃, induced methide abstraction from a silicon atom followed by rearrangement to afford the base free ferrous alkyl cation, [(ⁱPrPDI)Fe(CH₂SiMe₂CH₂SiMe₃)][MeB(C₆F₅)₃]. This complex is active for the polymerization of ethylene and yields polymers that are of higher molecular weight and narrower polydispersity than traditional methylalumoxane-activated catalysts.

Original language	English (US)
Pages (from-to)	9660-9661
Number of pages	2
Journal	Journal of the American Chemical Society
Volume	127
Issue number	27
DOIs	https://doi.org/10.1021/ja0524447
State	Published - Jul 13 2005
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Chemistry
Biochemistry
Catalysis
Colloid and Surface Chemistry

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title = "Bis(imino)pyridine iron(II) alkyl cations for olefin polymerization",

abstract = "Treatment of the five-coordinate ferrous dialkyl complex, (iPrPDI)Fe(CH2SiMe3)2 (iPrPDI = ((2,6-CHMe2)2C6H3N=CMe)2C5H3N), with [PhMe2NH][BPh4] in the presence of diethyl ether or tetrahydrofuran furnished the corresponding alkyl cations, where the donor ligand is coordinated in the basal plane of a distorted square pyramidal iron(II) alkyl cation. Performing the same reaction with the neutral Lewis acid, B(C6F5)3, induced methide abstraction from a silicon atom followed by rearrangement to afford the base free ferrous alkyl cation, [(iPrPDI)Fe(CH2SiMe2CH2SiMe3)][MeB(C6F5)3]. This complex is active for the polymerization of ethylene and yields polymers that are of higher molecular weight and narrower polydispersity than traditional methylalumoxane-activated catalysts.",

author = "Bouwkamp, {Marco W.} and Emil Lobkovsky and Chirik, {Paul J.}",

year = "2005",

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doi = "10.1021/ja0524447",

language = "English (US)",

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journal = "Journal of the American Chemical Society",

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publisher = "American Chemical Society",

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T1 - Bis(imino)pyridine iron(II) alkyl cations for olefin polymerization

AU - Bouwkamp, Marco W.

AU - Lobkovsky, Emil

AU - Chirik, Paul J.

PY - 2005/7/13

Y1 - 2005/7/13

N2 - Treatment of the five-coordinate ferrous dialkyl complex, (iPrPDI)Fe(CH2SiMe3)2 (iPrPDI = ((2,6-CHMe2)2C6H3N=CMe)2C5H3N), with [PhMe2NH][BPh4] in the presence of diethyl ether or tetrahydrofuran furnished the corresponding alkyl cations, where the donor ligand is coordinated in the basal plane of a distorted square pyramidal iron(II) alkyl cation. Performing the same reaction with the neutral Lewis acid, B(C6F5)3, induced methide abstraction from a silicon atom followed by rearrangement to afford the base free ferrous alkyl cation, [(iPrPDI)Fe(CH2SiMe2CH2SiMe3)][MeB(C6F5)3]. This complex is active for the polymerization of ethylene and yields polymers that are of higher molecular weight and narrower polydispersity than traditional methylalumoxane-activated catalysts.

AB - Treatment of the five-coordinate ferrous dialkyl complex, (iPrPDI)Fe(CH2SiMe3)2 (iPrPDI = ((2,6-CHMe2)2C6H3N=CMe)2C5H3N), with [PhMe2NH][BPh4] in the presence of diethyl ether or tetrahydrofuran furnished the corresponding alkyl cations, where the donor ligand is coordinated in the basal plane of a distorted square pyramidal iron(II) alkyl cation. Performing the same reaction with the neutral Lewis acid, B(C6F5)3, induced methide abstraction from a silicon atom followed by rearrangement to afford the base free ferrous alkyl cation, [(iPrPDI)Fe(CH2SiMe2CH2SiMe3)][MeB(C6F5)3]. This complex is active for the polymerization of ethylene and yields polymers that are of higher molecular weight and narrower polydispersity than traditional methylalumoxane-activated catalysts.

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ER -

Bis(imino)pyridine iron(II) alkyl cations for olefin polymerization

Abstract

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