A New Class of Stable, Saturated N‐Heterocyclic Carbenes with
<i>N</i>
‐Naphthyl Substituents: Synthesis, Dynamic Behavior, and Catalytic Potential
作者:Ludovic Vieille‐Petit、Xinjun Luan、Ronaldo Mariz、Sascha Blumentritt、Anthony Linden、Reto Dorta
DOI:10.1002/ejic.200900010
日期:2009.5
comprised of substituted naphthyl units. This generates C2-symmetric (anti) and Cs-symmetric (syn) atropisomers. The interconversion between the isomers is studied in detail both for the N-heterocyclic carbene salts and the free carbenes through variable-temperature 1H NMR spectroscopic studies; activation free energies are calculated and can be linked to the substitution pattern of the naphthyl moieties
已经合成了一个新的易于获得且稳定的咪唑啉-2-亚基,其中侧链由取代的萘基单元组成。这会生成 C2 对称(反)和 Cs 对称(syn)阻转异构体。通过变温 1H NMR 光谱研究,详细研究了 N-杂环卡宾盐和游离卡宾的异构体之间的相互转化;计算活化自由能并且可以将其与萘基部分的取代模式相关联。合成了包含新 N-杂环卡宾的钯配合物,初步数据表明这些化合物在芳基溴和芳基氯的 Buchwald-Hartwig 胺化反应中作为预催化剂表现良好。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)