Mono(aryloxido)Titanium(IV) Complexes and Their Application in the Selective Dimerization of Ethylene
作者:Jean‐Benoit Cazaux、Pierre Braunstein、Lionel Magna、Lucien Saussine、Hélène Olivier‐Bourbigou
DOI:10.1002/ejic.200900322
日期:2009.7
synthesis of mono(aryloxido)titanium(IV) complexes of general formula Ti[O(o-R)Ar]X3}, with X = OiPr, ArO = 2-tert-butyl-4-methylphenoxy and R = CMe3 (2a), CMe2Ph (2b) and CH2NMe2 (2c). Attempts to reach pure mono(aryloxido) complexes when R = CH2NMe(CH2Ph) (2d) or CH2N(CH2Ph)2 (2e) were unsuccessful. When R = CH2OMe, the analogous mononuclear complex was not obtained, and instead, a dinuclear complex [(2
我们报告了通式 Ti[O(oR)Ar]X3} 的单(芳基氧化)钛(IV)配合物的合成,其中 X = OiPr,ArO = 2-叔丁基-4-甲基苯氧基,R = CMe3 (2a)、CMe2Ph (2b) 和 CH2NMe2 (2c)。当 R = CH2NMe(CH2Ph) (2d) 或 CH2N(CH2Ph)2 (2e) 时,尝试获得纯单(芳基氧化)配合物均未成功。当 R = CH2OMe 时,没有得到类似的单核配合物,取而代之的是双核配合物 [(2-叔丁基-4-甲基-6-甲氧基甲基苯氧基) TiCl(OiPr)(μ2-OiPr)2TiCl(OiPr)2] (3) 形成。配合物 2b 和 3 通过单晶 X 射线衍射表征。前者包含一个四面体配位的 TiIV 中心,而在后者中,芳基氧化配体充当这两个化学上非常不同的金属中心之间的螯合桥接配体,形成两个共享面的八面体。评估并讨论了从 [Ti(OiPr)4]