(“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
G. Erker
中科院分区:
化学2区
文献类型:
--
作者:
X. Wang;R. Fröhlich;C. G. Daniliuc;B. Rieger;A. Jonovic;G. Kehr;G. Erker

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我们以手性二茂铁甲醛缩醛为起始原料,通过一条短的合成路线,对映选择性地合成了2-羟基-5-三甲基硅基二茂铁碳二亚胺体系。亚胺13 a-c用于合成两性离子(“二茂铁-salaldiminato”)2 ZrCl 4络合物14 a-c。用MAO活化得到均相齐格勒-纳塔催化剂,其仅显示出中等的乙烯聚合活性,类似于未取代的母体“二茂铁-salaldiminato”锆体系。因此,设计并实施了合成路线以获得相应的2-羟基-3,5-双(三甲基硅烷基)二茂铁碳二亚胺(21)。分别衍生自醛和苯胺或环己胺的对映体高度富集的配体(pS)-21a和d用于合成相应的(“二茂铁-salaldiminato”)2 ZrCl 4配合物22 a、d。两种催化剂在用MAO活化后均得到高活性的均相齐格勒-纳塔催化剂,用于形成线性低分子量聚乙烯。配合物22 d和许多配体前体从这两个序列进行了表征,通过X-射线衍射。
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.
一种极其简单的三取代二茂铁路线:1,1-二溴二茂铁和溴二茂铁的邻位锂化
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