1158827-95-2Relevant academic research and scientific papers
Neutral and monocationic half-sandwich methyl rare-earth metal complexes: Synthesis, structure, and 1,3-butadiene polymerization catalysis
Robert, Dominique,Spaniol, Thomas P.,Okuda, Jun
, p. 2801 - 2809 (2008)
Half-sandwich rare-earth metal tetramethylaluminate complexes [Ln(η5-C5Me4SiMe3){(μ-Me) 2(AlMe2)}2] (Ln = Y, La, Nd, Sm, Gd, Lu) were obtained by reaction of the neutral homoleptic tetramethylaluminate complex [Ln{(μ-Me)2-(AlMe2)}3] with tetramethyl(trimethylsilyl)cyclopentadiene, (C5Me4H) SiMe3. Protonolysis reaction of the neutral mono-(cyclopentadienyl) complexes with the Bronsted acid [NEt3H]+[BPh 4]- in thf led to the formation of the monocationic methyl complexes [Ln(η5-C5Me4SiMe 3)Me-(thf)3]+[BPh4]- (Ln = Y, La, Nd, Sm, Lu). Single-crystal X-ray diffraction study on the Y, Sm, and Lu derivatives showed a four-legged piano-stool configuration. Upon activation with [Ph3C]+[B(C6F5) 4]-, the neutral half-sandwich tetramethylaluminate complex [La(η5-C5Me4SiMe 3){(μ-Me)2(AlMe2)}2] catalyzed the polymerization of butadiene in the presence of [AliBu3] to give trans-1,4-polybutadiene with narrow polydispersities (Mn/M w = 1.05-1.09). Wiley-VCH Verlag GmbH & Co. KGaA, 2008.
