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Dominique Robert, Thomas P. Spaniol and Jun Okuda Neutral and Monocationic Half-Sandwich Methyl Rare-Earth Metal Complexes: Synthesis, Structure, and 1,3-Butadiene Polymerization Catalysis European Journal of Inorganic Chemistry 2008

Article first published online: 28 FEB 2008 | DOI: 10.1002/ejic.200800040

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Half-sandwich rare-earth metal tetramethylaluminate complexes [Ln(η5-C5Me4SiMe3){(μ-Me)2(AlMe2)}2] (Ln = Y, La, Nd, Sm, Lu) were protonolyzed to give monocationic methyl complexes [Ln(η5-C5Me4SiMe3)Me(thf)3]+[BPh4]. Upon activation with [Ph3C]+[B(C6F5)4], the neutral half-sandwich tetramethylaluminate complex catalyzed the polymerization of butadiene in the presence of [AliBu3] to give trans-1,4-polybutadiene with narrow polydispersities (Mn/Mw = 1.05–1.09).

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