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学科主题: 金属有机化学
题名: Synthesis, structure, and catalytic behavior of rac-1,1-(3-oxapentamethylene)-Bridged bis(indenyl)ansa-Lanthanidocenes
其他题名: 对消旋氧杂五亚甲基桥联双茚基茂稀土金属配合物的合成结构和催化性质
作者: Qian ZT(钱长涛) ; Zou G(邹刚) ; Chen YF(陈耀峰) ; Sun J(孙杰)
通讯作者: 钱长涛
刊名: Organometallics
发表日期: 2001-01-01
卷: 20, 期:14, 页:3106-3112
收录类别: SCI
部门归属: 中国科学院上海有机化学研究所金属有机化学开放实验室
英文摘要: A series of chiral 1,1'-(3-oxapentamethylene)-bridged bis(indenyl)ansa-lanthanidocenes have been high stereoselectively synthesized. The reaction of YbCl^3 with O9CH^2CH^2C^9H^6K)^2 in THF provided a rac/meso mixture of [O(CH^2CH^2C^9H^6)^2]YbCl(thf)(1) was isolated after recrystallization of a rac/meso mixture of [O(CH^2CH^2CH^2C^9H^6)^2]YbCl(thf) in THF. Direct amidation (or alkylation) of the rac/meso lanthanidocence chloride mixtures in toluene provided solely pure racemic ansa-lanthanidocene amides [O(CH^2CH^2C^9H^6)^2LnN(SiMe^3)^2(Ln=Y(2), Pr(3), Nd(4), Yb(5),Lu(6) and pure racemic ansa-lanthanidocene hydrocarbyls [[O(CH^2CH^2C^9H^6)^2LnNCH^2e^3)^(Ln=Dy (7), Yb(8)), The structures of 1 and 5 were determined by X-ray diffraction. The amide and hydrocarbyl complexes are efficient single-component catalysts for methyl methacrylate polymerization. The effects of solvent and reaction temperature on the polymerization were studied. Very high molecular weigh (M^n>10~6)iso-rich poly(MMA) was obtained at lower temperature, while low molecular weight moderatedly syndiotactic poly(MMA) was obtained at higher temperature. The polymerization behavior is proosed to be associated with rac/meso interconversion of the active center.
语种: 英语
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内容类型: 期刊论文
URI标识: http://ir.sioc.ac.cn/handle/331003/15221
Appears in Collections:金属有机化学国家重点实验室_期刊论文

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Recommended Citation:
Qian ZT,Zou G,Chen YF,et al. Synthesis, structure, and catalytic behavior of rac-1,1-(3-oxapentamethylene)-Bridged bis(indenyl)ansa-Lanthanidocenes[J]. Organometallics,2001,20(14):3106-3112.
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