Iridium Complexes of CCC-Pincer N-Heterocyclic Carbene Ligands: Synthesis and Catalytic C−H Functionalization
作者:Anthony R. Chianese、Allen Mo、Nicole L. Lampland、Raymond L. Swartz、Paul T. Bremer
DOI:10.1021/om100302g
日期:2010.7.12
5-di-tert-butylphenyl side groups, reaction with [Ir(1,5-cyclooctadiene)Cl]2 in acetonitrile with either excess triethylamine or stoichiometric cesium fluoride as base gave neutral, iridium(III) pincer complexes of the formula Ir(CCC)HCl(MeCN), which were purified by chromatography on silica gel. Metalation failed under these conditions for a 2,6-diisopropylphenyl-substituted derivative. In combination with NaOtBu
合成了一系列四个间亚苯基桥联的双苯并咪唑氯化物,作为刚性,单阴离子,CCC钳形N杂环卡宾配体的前体。对于具有1,3,5-二甲苯基或3,5-二叔丁基苯基侧基的配体,可与乙腈中的[Ir(1,5-环辛二烯)Cl] 2与过量的三乙胺或化学计量的氟化铯反应得到式Ir(CCC)HCl(MeCN)的中性铱(III)钳形配合物,将其通过硅胶色谱法纯化。在这些条件下,2,6-二异丙基苯基取代的衍生物的金属化失败。这些配合物与NaO t Bu结合形成活性催化剂,用于在纯芳烃溶剂中进行环辛烷的无受体脱氢和芳烃CH硼化。