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  Neodymium(III) Complexes with Bulky ansa-Bis(cyclopentadienyl) Ligands:  Synthesis and Use in Olefin Oligomerization

Bogaert, S., Chenal, T., Mortreux, A., Nowogrocki, G., Lehmann, C. W., & Carpentier, J.-F. (2001). Neodymium(III) Complexes with Bulky ansa-Bis(cyclopentadienyl) Ligands:  Synthesis and Use in Olefin Oligomerization. Organometallics, 20(1), 199-205. doi:10.1021/om0006357.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0024-65B1-F Version Permalink: https://hdl.handle.net/21.11116/0000-0007-1534-7
Genre: Journal Article

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 Creators:
Bogaert, Stéphane1, Author
Chenal, Thomas1, Author
Mortreux, André1, Author
Nowogrocki, Guy2, Author
Lehmann, Christian W.3, Author           
Carpentier, Jean-François1, Author
Affiliations:
1Laboratoire de Catalyse de Lille (CNRS UPRESA 8010), Ecole Nationale Supérieure de Chimie de Lille, B.P. 108, 59652 Villeneuve d'Ascq, France , ou_persistent22              
2Laboratoire de Cristallochimie et Physicochimie du Solide (CNRS UPRESA 8012), Ecole Nationale Supérieure de Chimie de Lille, B.P. 108, 59652 Villeneuve d'Ascq, France, ou_persistent22              
3Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445625              

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 Abstract: The trivalent neodymium complexes [rac-{Me2Si(η5-2-SiMe3-4-t-Bu-C5H2)2}Nd(μ-Cl)2Li(THF)2] (rac-3), [rac-{Me2Si(η5-2,4-(SiMe3)2C5H2)2}Nd(μ-Cl)2Li(THF)2] (rac-5), and [{Me2Si(η5-2,4-(SiMe3)2C5H2)(η5-3,4-(SiMe3)2C5H2)}Nd(μ-Cl)2Li(THF)2] (C1-6) have been prepared and their structures investigated by NMR and X-ray crystallography. These new chlorolanthanocenes, when combined in situ with a dialkylmagnesium cocatalyst, initiate the polymerization of ethylene and 1-octene to yield di(oligoalkyl)magnesium species, which can be finally hydrolyzed to oligomers. Bulky bridged complexes rac-3, rac-5, and C1-6 gave significantly more active catalysts for 1-octene oligomerization (Mn = 400−1300, Mw/Mn = 1.11−1.65) than systems based on nonbridged complexes [(η5-C5Me5)2Nd(μ-Cl)2Li(Et2O)2] (1) and [(η5-1,3-(SiMe3)2C5H3)2Nd(μ-Cl)2Li(THF)2] (7). Ethylene oligomerization (Mn = 400−5000) was best achieved with complexes 1 and rac-3, as important catalyst decay occurred with bridged bis(trimethylsilyl) systems rac-5 and C1-6.

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Language(s): eng - English
 Dates: 2000-07-242000-12-062001-01-01
 Publication Status: Issued
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/om0006357
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Title: Organometallics
  Other : Organometallics
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: - Volume / Issue: 20 (1) Sequence Number: - Start / End Page: 199 - 205 Identifier: ISSN: 0276-7333
CoNE: https://pure.mpg.de/cone/journals/resource/954925505259