<i>N</i>-Oxide as a Traceless Oxidizing Directing Group: Mild Rhodium(III)-Catalyzed CH Olefination for the Synthesis of<i>ortho</i>-Alkenylated Tertiary Anilines
作者:Xiaolei Huang、Jingsheng Huang、Chenglong Du、Xingyi Zhang、Feijie Song、Jingsong You
DOI:10.1002/anie.201307174
日期:2013.12.2
Double role: A traceless directinggroup also acts as an internal oxidant in a novel RhIII‐catalyzed protocol developed for the synthesis of ortho‐alkenylated tertiary anilines (see scheme). A five‐membered cyclometalated RhIII complex is proposed as a plausible intermediate and confirmed by X‐ray crystallographic analysis.
Inclusion compounds of cationic, anionic, and neutral p-substituted derivatives of tert-butylbenzene complexed in beta-cyclodextrin and its ionic 6-mono and 6-hepta derivatives were systematically investigated by isothermal titration calorimetry (ITC). All inclusion compounds showed 1:1 stoichiometry with binding constants ranging from 10 to 3 x 10(6) M(-1). The binding free energies could be subdivided
通过等温滴定量热法(ITC)系统地研究了络合在β-环糊精中的叔丁基苯的阳离子,阴离子和中性对位取代衍生物的包合物。所有包含化合物均显示1:1的化学计量比,结合常数范围为10到3 x 10(6)M(-1)。结合自由能可细分为非极性和静电贡献。静电相互作用可以根据库仑定律通过考虑主体和客体的质子化程度,主体内客体的方向以及Debye-Huckel-Onsager理论描述的离子屏蔽来定量描述。客体在环糊精腔内的取向通过ROESY NMR光谱法确定。