Iridium-mediated N–H and methyl C–H bond activations in N-(2′,6′-dimethylphenyl)pyrrole-2-aldimine. Synthesis, characterization and catalytic applications
作者:Piyali Paul、Michael G. Richmond、Samaresh Bhattacharya
DOI:10.1016/j.jorganchem.2013.07.066
日期:2014.2
Reaction of N-(2′,6′-dimethylphenyl)pyrrole-2-aldimine (L-Me2) with Ir(PPh3)3Cl in refluxing toluene affords two organometallic complexes (1 and 2), where the imine-ligand (L-Me2) is coordinated to the metal center, via N–H and methyl C–H activations, as a di-anionic tridentate NNC-donor, along with two triphenylphosphines. In 1 the sixth coordination site is occupied by a hydride, while in 2 by a chloride
N-(2',6'-二甲基苯基)吡咯-2-醛亚胺(L-Me 2)与Ir(PPh 3)3 Cl在回流的甲苯中反应生成两个有机金属配合物(1和2),其中亚胺配体(L-Me 2)通过N-H和甲基C-H活化与二中心三齿NNC供体以及两个三苯基膦配位到金属中心。在第一个中,第六个配位点被氢化物占据,而在第二个中,被氯化物占据。在两种情况下,氢化物或氯化物是反式的协调亚胺氮,和两个三苯基膦是相互反。N-(2'-甲基苯基)吡咯-2-醛亚胺(L-Me)与Ir(PPh 3)3 Cl的类似反应得到3,其中亚胺配体以单阴离子双齿的形式与金属中心配位NN-供体,以及两个三苯基膦,氢化物和氯化物。的结构1,2和3已经通过X射线晶体学确定。已经进行了DFT分析以了解复合物的形成。所有的配合物都显示出特征性的1 H NMR信号,并在可见光和紫外线区域发生强烈的跃迁。在所有三个复合节目循环伏安2个0.89-1.34内伏不可逆转的氧化VS。SCE和-1