CH Bond Activation with Triel Metals: Indium and Gallium Zwitterions through Internal Hydride Abstraction in Rigid Salan Ligands
作者:Nicolas Maudoux、Jian Fang、Thierry Roisnel、Vincent Dorcet、Laurent Maron、Jean‐François Carpentier、Yann Sarazin
DOI:10.1002/chem.201402358
日期:2014.6.16
hydropyrimidine salan (salan=N,N′‐dimethyl‐N,N′‐bis[(2‐hydroxyphenyl)methylene]‐1,2‐diaminoethane) proteo‐ligands with a rigid backbone ON^(CH2)^NO}H2 react with M(CH2SiMe3)3 (M=Ga, In) to yield the zwitterions ON^(CH+)^NO}M−(CH2SiMe3)2 (M=Ga, 2; In, 3) by abstraction of a hydride from the ligand backbone followed by elimination of dihydrogen. By contrast, with Al2Me6, the neutral‐at‐metal bimetallic
具有刚性骨架ON ^(CH 2)^ NO的氢嘧啶salan(salan = N,N'-二甲基-N,N'-双[(2-羟基苯基)亚甲基] -1,2-二氨基乙烷)蛋白配体。}ħ 2与反应M(CH 2森达3)3(M =镓,铟),得到两性离子ON ^(CH +)^ NO} M -(CH 2森达3)2(M =镓,2 ;在3)中,通过从配体主链上提取氢化物,然后消除二氢。相比之下,与Al 2 Me 6,定量获得中性金属双金属配合物[ON ^(CH 2)^ NO} AlMe] 2([1] 2)。还观察到铟两性离子的形成,在空间上更阻碍了酚基环上包含o- Me取代基或杂环核心中的N(CHPh)N部分的配体。总体而言,易于的C H键活化如下顺序Al«Ga<在。基于模型配合物,XRD研究和2 H NMR光谱的实验数据表明,Ga / In两性离子的形成涉及SiMe 4的快速释放,随后是H 2的释放。,并