Alkaline Earth Metallocenes Coordinated with Ester Pendants: Synthesis, Structural Characterization, and Application in Metathesis Reactions
作者:Heng Li、Wen-Xiong Zhang、Zhenfeng Xi
DOI:10.1002/chem.201301618
日期:2013.9.16
chlorides. Direct deprotonation of the ester‐substituted cyclopentadienes with Ae[N(SiMe3)2]2 (Ae=Ca, Sr, Ba) efficiently generated members of a new class of heavier alkaline earth (Ca, Sr, Ba) metallocenes in good to excellent yields. Single‐crystal X‐ray structural analysis demonstrated that these heavier alkaline earth metallocenes incorporated two intramolecularly coordinated ester pendants and multiply‐substituted
通过1,4-二硫代1,3,3-丁二烯,CO和酰氯的一锅法反应已经合成了各种酯取代的环戊二烯衍生物。酯取代的环戊二烯与Ae [N(SiMe 3)2 ] 2的直接去质子化(Ae = Ca,Sr,Ba)有效生成新型的较重碱土金属(Ca,Sr,Ba)茂金属,收率高至优异。X射线单晶结构分析表明,这些较重的碱土金属茂结合了两个分子内配位的酯侧基和多取代的环戊二烯基配体。相应的过渡金属茂金属,例如二茂铁衍生物和半三明治环戊二烯基三羰基hen络合物,可以通过复分解反应高效生成。带有酯侧基的多取代的环戊二烯配体,以及相应的较重的碱土金属和过渡金属茂金属,可能在配位化学,有机金属化学和有机合成中有进一步的应用。