N-(2-(1H-pyrazol-1-yl)phenyl)-picolinamide ligands 3a–c and 5a–f have been easily prepared from commercially available 2-pyridinecarboxylic acid. Reaction of 3a–c and 5a–f with PdCl₂ in toluene in the presence of triethylamine gave the nine NNN pincer Pd(II) complexes 6a–i in 15–91% yields. All the new compounds were characterized by ¹H, ¹³C NMR spectra and HRMS. In addition, the molecular structures of complexes 6a and 6i have also been determined by single-crystal X-ray diffraction. The obtained palladium(II) catalysts showed efficient catalytic activity toward the Heck coupling of aryl bromides with styrenes. Under the condition of 5% catalyst loading, the expected various styrenes were obtained in moderate to high yields (up to 99% yield).

N- (2-(1H-吡唑-1-基)苯基)-吡啶酰胺配体3a-c和5a-f可以很容易地从市售的 2-吡啶甲酸制备。在三乙胺存在下，3a-c和5a-f与 PdCl ₂在甲苯中反应，得到 9 个 NNN 钳形 Pd(II) 配合物6a-i，产率为 15-91%。所有新化合物均通过¹ H、¹³ C NMR 谱和 HRMS 进行了表征。此外，配合物6a和6i的分子结构也已通过单晶X射线衍射确定。所得钯(II)催化剂对芳基溴与苯乙烯的Heck偶联表现出有效的催化活性。在催化剂负载量为5%的条件下，以中等到高收率（高达99%的收率）获得了预期的各种苯乙烯。