A polymer-anchored Pd(II) Schiff base complex has been synthesized by reacting a polymeric amine with 2-pyridinecarboxaldehyde to get the polymer-anchored Schiff base, which was then reacted with palladium acetate. The catalyst was characterized by physicochemical and spectroscopic methods. It shows excellent catalytic activity in the Sonogashira coupling of phenylacetylene with aryl halides using triethylamine as a base and copper iodide as a co-catalyst in water under open air at 70 °C. We have also studied the effects of base and solvent on the coupling reaction. Sonogashira reactions of phenylacetylene with a variety of functionalized aryl halides were performed under the optimized reaction conditions. This catalyst gives excellent yields without the use of phosphine ligands. Further experiments showed that the catalyst can be used five times without much loss in the catalytic activity.
合成了一种聚合物固定的Pd(II) Schiff碱复合物,该复合物是通过聚合物胺与2-
吡啶甲醛反应得到的聚合物固定的Schiff碱,随后与
醋酸钯反应。催化剂通过物理
化学和光谱学方法进行了表征。它在
水中于开放空气下,在70°C时,使用
三乙胺作为碱和
碘化
铜作为助催化剂进行
苯乙炔与芳基卤化物的Sonogashira偶联反应时表现出优异的催化活性。我们还研究了碱和溶剂对偶联反应的影响。在优化反应条件下,进行了
苯乙炔与多种功能化芳基卤化物的Sonogashira反应。该催化剂在不使用
膦配体的情况下,提供了优异的产率。进一步实验显示,该催化剂可以重复使用五次,而催化活性损失不大。