Palladacycles of Thioethers Catalyzing Suzuki–Miyaura C–C Coupling: Generation and Catalytic Activity of Nanoparticles
作者:Gyandshwar Kumar Rao、Arun Kumar、Satyendra Kumar、Umesh B. Dupare、Ajai K. Singh
DOI:10.1021/om4001956
日期:2013.4.22
thioether ligands, 2–HO–4–R–C6H3–(C6H4)CHNH(CH2)3SPh [R = H (L1) or −OMe (L2)] react with Na2PdCl4, giving palladacycles [PdCl(C–,N,S)] (1: (C–,N,S) = L1–H; 2: (C–,N,S) = L2–H). The 1H and 13C1H} NMR spectra of ligands and their palladacycles have been found to be characteristic. Complexes 1 and 2 have also been characterized with HR-MS. The crystal structure of 2 has been solved. The Pd–S bond length
三齿硫醚配体2–HO–4–R–C 6 H 3 –(C 6 H 4)CHNH(CH 2)3 SPh [R = H(L1)或-OMe(L2)]与Na 2 PdCl 4反应,赋予钯环[的PdCl(C -,N,S)](1:(C -,N,S)= L1 -H; 2:(C -,N,S)= L2 -H)。已发现配体及其palladacycles的1 H和13 C 1 H} NMR光谱具有特征性。配合物1HR-MS还对2和3进行了表征。的晶体结构2已经解决。Pd–S键的长度为2.428(2)Å,钯具有近似正方形的平面几何形状。在使用1和2作为催化剂的Suzuki–Miyaura C–C偶联催化过程中,两种配合物均意外地形成了Pd 16 S 7纳米颗粒(NPs)。这是首次用这种偶联反应中使用的硫醚的Palladacycles进行这种观察。2进行耦合的效率明显低于1。复杂2在配体结构中具有一个额外的-OMe基团,由该络合物形成的Pd