Synthesis, crystal structures, and application of two new pincer type palladium(II)-Schiff base complexes in C-C cross-coupling reactions
作者:Bhumika Agrahari、Samaresh Layek、Anuradha、Rakesh Ganguly、Devendra D. Pathak
DOI:10.1016/j.ica.2017.11.018
日期:2018.2
Abstract Two new pincer type Pd(II)-Schiff base complexes of the general formula [PdL 1 (PPh 3 )] 1 and [PdL 2 (PPh 3 )] 2, (where L 1 = 2-(2,3-Dihydroxybenzylideneamino)phenolate and L 2 = 2-(2,3-dihydroxybenzylidene)hydrazinecarbothioamidate) were synthesised by the reaction of the palladium acetate with the corresponding ligand in methanol as yellow crystalline solids in high yields. Both complexes
摘要两种新的钳型Pd(II)-Schiff碱配合物,其通式为[PdL 1(PPh 3)] 1和[PdL 2(PPh 3)] 2,其中L 1 = 2-(2,3-二羟基苄叉亚氨基通过乙酸钯与相应的配体在甲醇中以黄色结晶固体的高产率反应,合成了苯酚盐和L 2 = 2-(2,3-二羟基亚苄基)肼基氨基甲硫基氨基甲酸)。两种配合物均通过FT-IR,1 H NMR,13 C NMR,31 P NMR,元素分析和单晶X射线衍射研究得到充分表征。两种情况下,晶体结构均证实了钳型席夫碱配体的三齿性质和金属中心周围扭曲的正方形平面几何形状。三苯基膦充当辅助配体并占据了钯的第四个配位位点。发现该络合物在低催化剂负载量(0.08mol%)下且不使用任何添加剂的情况下是用于一系列Suzuki-Miyaura,Heck-Mizoroki和Sonogashira反应的有效均相催化剂。通过1 H和13 C NMR研究充分表征了所有有机产物。