Highly efficient palladium(<scp>ii</scp>) hydrazone based catalysts for the Suzuki coupling reaction in aqueous medium
作者:Subramanian Muthumari、Rengan Ramesh
DOI:10.1039/c6ra06734d
日期:——
and reveal the presence of a distorted square planar geometry around the Pd ion. The complexes 1–5 (0.05 mol%) have been found to be a highly active catalytic system in the mono and double Suzuki–Miyaura cross coupling reaction of deactivated aryl and heteroaryl bromides with different types of aryl boronic acids in neat water and the maximum yield was up to >99%. Notably, these catalysts work well with
合成了一种新的通式为[PdCl(PPh 3)(L)]的空气稳定型钯(II)苯并zone配合物(其中HL =噻吩醛苯并恶唑酮),其中PPh 3和氯化物为共配体。简单便捷的步骤,收率高。所有新的络合物均已通过元素分析,IR,UV-vis和NMR光谱法进行了全面表征。通过单晶X射线晶体学确定了三种配合物的分子结构,这证实了苯并zone的配位模式并揭示了在Pd离子周围存在扭曲的正方形平面几何形状。配合物1-5在纯水中,失活的芳基和杂芳基溴化物与不同类型的芳基硼酸的单和双Suzuki-Miyaura交叉偶联反应中,发现(0.05 mol%)是高活性催化体系。 99%。值得注意的是,这些催化剂在催化剂的超低负载下工作良好,并且在短时间内针对不同的底物表现出高周转率。而且,催化剂可以简单地回收并重复使用五次而不会显着损失效率。