Oxine based unsymmetrical (O<sup>−</sup>, N, S/Se) pincer ligands and their palladium(<scp>ii</scp>) complexes: synthesis, structural aspects and applications as a catalyst in amine and copper-free Sonogashira coupling
作者:Satyendra Kumar、Fariha Saleem、Manish Kumar Mishra、Ajai K. Singh
DOI:10.1039/c7nj00067g
日期:——
L3 and L4. Upon reaction with Na2PdCl4/[Pd(CH3CN)2Cl2], L1–L4 coordinated as a (O−, N, E) donor (E = S/Se) resulting in complexes [Pd(L–H)Cl] (1–4; L = L1–L4). The molecular structures of L1, 1 and 2 were established by single crystal X-ray diffraction. The palladium in 1 and 2 has a nearly square planar geometry. The Pd–S bond distance in 1 is 2.2648(14) Å and in 2, the Pd–Se bond distance is 2.3641(7)
具有8-羟基喹啉(oxine)核心的不对称钳夹配体。2-(苯硫基/硒甲基)喹啉-8-醇(L1 / L2),2-(N,N-二甲基硫代氨基甲酰基)喹啉-8-醇(L3)和2-(吡咯烷基-1-基硫代氨基甲酰基)喹啉-8-醇(L4)被合成。将2-甲基喹啉8-醇转化为2-溴甲基喹啉8-醇,与PhENa(E = S或Se)反应生成L1和L2,在适当的喹啉醛衍生物上进行Willgerodt-Kindler反应得到L3和L4。与Na 2 PdCl 4反应时/ [加入Pd(CH 3 CN)2氯2 ],L1-L4协调作为(O -,N,E)供体(E = S / SE),得到配合物[钯(大号-H)CL](1- 4 ; L = L1-L4)。的分子结构L1,1和2通过单晶X射线衍射来建立。1和2中的钯具有近似正方形的平面几何形状。在PD-S键的距离1是2.2648(14)A和2中,PD-Se键距离为2.3641(7)