Rare-Earth-Metal Alkylaluminates Supported by N-Donor-Functionalized Cyclopentadienyl Ligands: CH Bond Activation and Performance in Isoprene Polymerization
作者:Lars N. Jende、Cäcilia Maichle-Mössmer、Reiner Anwander
DOI:10.1002/chem.201302388
日期:2013.11.25
with the larger rare‐earth‐metal ions lanthanum and neodymium. X‐ray diffraction analysis revealed the formation of isostructural complexes and the CH bond activation of one aminomethyl group. The formation of Ln(μ‐CH2)Al moieties was further corroborated by 13C and 1H‐13C HSQC NMR spectroscopy. In the case of the largest metal center, lanthanum, this CH bond activation could be suppressed at −35 °C
同质四甲基铝酸盐配合物[Ln(AlMe 4)3 ](Ln = La,Nd,Y)与HCp NMe2(Cp NMe2 = 1- [2-(N,N-二甲基氨基)-乙基] -2,3,4, 5-戊基环戊二烯基)在-35°C的戊烷中生成半三明治稀土金属配合物[C 5 Me 4 CH 2 CH 2 NMe 2(AlMe 3)} Ln(AlMe 4)2 ]。通过使用等摩尔量的Et 2通过取代供体来去除N-供体配位的三甲基铝基团Ø在环境温度下仅产生的亚甲基桥接的配合物[C 5我4 CH 2 CH 2 NME(μ-CH 2)阿尔梅3 } LN(阿尔梅4)]有较大的稀土类金属离子的镧和钕。X射线衍射分析显示同构结构的形成和一个氨基甲基的CH键活化。Ln的形成(μ-CH 2)的A1基团通过进一步证明13 C和1个H- 13 C ^ HSQC NMR谱。在最大的金属中心,镧,本C的情况下H键激活可以在-35°C抑制,从而导致[[Cp