Synthesis and Characterization of Chiral Group 4 Metallocene Alkyne Complexes: (η5-menthyl-C5H4)2M(η2-Me3SiC2SiMe

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• 作者：Marcus Klahn ; Wolfgang Baumann ; Perdita Arndt ; Vladimir V. Burlakov ; Thomas Schareina ; Anke Spannenberg ; Uwe Rosenthal
• 刊名：Organometallics
• 出版年：2009
• 出版时间：February 9, 2009
• 年：2009
• 卷：28
• 期：3
• 页码：915-918
• 全文大小：115K
• 年卷期：v.28,no.3(February 9, 2009)
• ISSN：1520-6041

文摘

Reaction of the menthyl-substituted metallocene dichlorides (η⁵-menthyl-C₅H₄)₂MCl₂ (M = Ti (1-Ti), Zr (1-Zr)) with magnesium in the presence of Me₃SiC₂SiMe₃ in THF gives the chiral group 4 metallocene alkyne complexes of titanium and zirconium (η⁵-menthyl-C₅H₄)₂M(Me₃SiC₂SiMe₃) (M = Ti (2-Ti), Zr (2-Zr)). Both complexes show a similar complexation behavior and reactivity to their achiral metallocene congeners. For example, the reaction with ethylene was studied; whereas the zirconium complex 2-Zr yields the zirconacyclopentane 3 in a well-defined reaction, the titanium analogue 2-Ti produces only an as yet unseparable mixture of different compounds. 2-Ti, 2-Zr, and 3 were characterized by X-ray crystal structure analysis.