摘要通过1,3-二烷基过氢苯并咪唑鎓盐与氧化银(I)的反应以高收率合成了银(I)N-杂环卡宾配合物,并用作合成钯(II)N-杂环卡宾配合物的金属转移试剂。使用元素分析,1 H NMR和13 C NMR光谱对所有配合物进行表征。研究了Pd(II)-NHC配合物在吡咯衍生物直接芳基化中的催化活性。这些Pd(II)-NHC配合物对吡咯衍生物与易得且廉价的芳基氯化物进行直接芳基化反应显示出良好的催化性能。通过使用1mol%的钯络合物,芳基化反应以中等至良好的产率区域选择性地产生C 2或C 5芳基化产物。
Synthesis of 1,3-Dialkylperhydrobenzimidazolinium Salts and Their Catalytic Properties in Heck Reactions
摘要:
Novel eight 1,3-dialkylperhydrobenzimidazolinium chloride salts 3a-h were prepared as precursors of N-heterocyclic carbenes by reacting N,N'-dialkylcyclohexanediamine, triethyl orthoformate and ammonium chloride. The salts were characterized spectroscopically and the complexes formed in situ from Pd(OAc)(2) and 3 have been tested as catalysts in homogenous Heck coupling reactions.
Active ruthenium(II)-NHC complexes for alkylation of amines with alcohols using solvent-free conditions
作者:Beyhan Yiğit、Emine Özge Karaca、Murat Yiğit、Nevin Gürbüz、Hakan Arslan、İsmail Özdemir
DOI:10.1016/j.poly.2019.114234
日期:2020.1
transmetallation reactions between silver(I) N-heterocyclic carbene complexes and [RuCl2(p-cymene)]2. All of the obtained complexes were characterized by FT-IR, 1H NMR and 13C NMR spectroscopy, and the molecular structure of compound 3c was also determined by X-ray crystallography. These ruthenium complexes were tested for the alkylation of aromaticamines with a wide range of primary alcohols under solvent-free
摘要通过银(I)N-杂环卡宾配合物与[RuCl2(p-cymene)] 2的金属间转移反应,制备了一系列带有苄基的N-杂环卡宾配体的钌(II)配合物。通过FT-IR,1 H NMR和13 C NMR光谱对所有获得的配合物进行表征,并且还通过X射线晶体学测定化合物3c的分子结构。在无溶剂条件下,使用氢借用策略对这些钌配合物进行了芳香胺与多种伯醇烷基化的测试。此处测试的所有化合物对这些反应均显示出优异的催化活性,并且使用2.5摩尔%的钌络合物选择性地获得了N-单烷基化产物。