Synthesis and Molecular Structure of Bis(cyclopentadienyl) Cyclohexyloxy Lanthanide Compounds and Their Catalytic Activity

Chin. J. Org. Chem. ›› 2003, Vol. 23 ›› Issue (7): 646-649. Previous Articles Next Articles

二茂基环己氧基稀土化合物的合成、分子结构和催化活性

袁福根;陈丽;翁林红;杨静

苏州科技学院化学化工系;复旦大学化学系

发布日期:2003-07-25

Synthesis and Molecular Structure of Bis(cyclopentadienyl) Cyclohexyloxy Lanthanide Compounds and Their Catalytic Activity

Yuan Fugen;Chen Li;Wen Linhong;Yang Jing

Department of Chemistry, University of Science and Technology of Suzhou;Department of Chemistry, Fudan University

Published:2003-07-25

Abstract

Reaction of CpjLn (Ln = Sm, Yb) with cyclohexanol in a 1:1 molar ratio afforded the title compounds [ CpjLnOC^Hn \ (Ln = Sm, Yb). They were characterized by elemental analysis and infrared spectrum. The ytterbium complex was analyzed by X-ray crystallography. It is a dimer with two oxygen atoms bridging two ytterbium atoms. The cyclohexyl group displays chair-shape configuration and the 0-C (cyclohexyl group) bond stretches as a level e-bond. [C^LnOCgHn\ (Ln = Sm, Yb) showed rather poor catalytic activity for the polymerization of e- caprolactone. The 1:4 adduct of [CpjYbOCgHn^ and e-caprolactone showed much better catalytic activity than its precursor [C^YbOCfiHn^. This demonstrates that the slow reaction rate of initiation is an important factor to affect the apparent catalytic activity of [Cr^YbOCgHnla for the polymerization of e-caprolactone.

Key words: SAMARIUM COMPLEX;YTTERBIUM COMPLEX;CAPROLACTONE;CATALYTIC ACTIVITY, XRD;CYCLOHEXANOL

CLC Number:

O629

Cite this article

Yuan Fugen;Chen Li;Wen Linhong;Yang Jing. Synthesis and Molecular Structure of Bis(cyclopentadienyl) Cyclohexyloxy Lanthanide Compounds and Their Catalytic Activity[J]. Chin. J. Org. Chem., 2003, 23(7): 646-649.

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二茂基环己氧基稀土化合物的合成、分子结构和催化活性

Synthesis and Molecular Structure of Bis(cyclopentadienyl) Cyclohexyloxy Lanthanide Compounds and Their Catalytic Activity

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