(“Ferrocene-salaldiminato”)zirconium Complexes for Ethylene Polymerization Catalysis: The Role of the Bulky Substituents
(“Ferrocene-salaldiminato”)zirconium Complexes for Ethylene Polymerization Catalysis: The Role of the Bulky Substituents
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用于乙烯聚合催化的(“二茂铁-salaldiminato”)锆配合物:大体积取代基的作用
DOI:
10.1021/om3004509
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发表时间:
2012
期刊:
影响因子:
2.8
通讯作者:
G. Erker
中科院分区:
文献类型:
--
作者:
X. Wang;R. Fröhlich;C. G. Daniliuc;B. Rieger;A. Jonovic;G. Kehr;G. Erker
We prepared the 2-hydroxy-5-trimethylsilylferrocenecarbaldimine systems13enantioselectively by a short synthetic route starting from the chiral ferrocene carbaldehyde acetal5. The imines13a–cwere used to synthesize the zwitterionic (“ferrocene-salaldiminato”)2ZrCl4complexes14a–c. Activation with MAO gave homogeneous Ziegler–Natta catalysts, which showed only a moderate ethylene polymerization activity, similar to the unsubstituted parent “ferrocene-salaldiminato” zirconium systems. Consequently, a synthetic route was devised and carried out to make the corresponding 2-hydroxy-3,5-bis(trimethylsilyl)ferrocenecarbaldimines (21) available. The enantiomerically highly enriched ligands (pS)-21aand -dderived from the aldehyde and aniline or cyclohexylamine, respectively, were used to synthesize the corresponding (“ferrocene-salaldiminato”)2ZrCl4complexes22a,d. Both gave highly active homogeneous Ziegler–Natta catalysts upon activation with MAO for the formation of linear low molecular weight polyethylene. Complex22dand many ligand precusors from both sequences were characterized by X-ray diffraction.
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影响因子:
3.8
作者:
I. Butler;S. Müssig;Matthias Plath
通讯作者:
Matthias Plath
影响因子:
3.8
作者:
Butler, IR;Drew, MGB
通讯作者:
Drew, MGB
影响因子:
2.3
作者:
Anne Masson;O. Riant;A. Gref;H. Kagan
通讯作者:
H. Kagan
影响因子:
2.8
作者:
Joachim W. Strauch;T. H. Warren;G. Erker;R. Fröhlich;P. Saarenketo
通讯作者:
P. Saarenketo
影响因子:
3.8
作者:
I. Butler;M. Drew;C. Greenwell;E. Lewis;Matthias Plath;S. Mussig;J. Szewczyk
通讯作者:
J. Szewczyk