Homoleptic cis- and trans-palladium(II) bis(guanidinato) complexes derived from N-aryl-N′,N″-di(pyridin-2-yl)- and N-aryl-N′,N″-bis(6-methylpyridin-2-yl)guanidines: Catalysts for Heck-Mizoroki coupling reactions
作者:Vishwesh Mishra、Jisha Mary Thomas、Sivasankar Chinnappan、Natesan Thirupathi
DOI:10.1016/j.jorganchem.2019.04.009
日期:2019.8
in 75%–81% yields. Reactions of Pd(OAc)2 with guanidines 2–7 carried out separately in toluene at 60 °C for 3 h afforded 8–13 respectively in 69%–80% yields. Compounds 1–13 were characterized by elemental analyses, HR-MS, IR and NMR (1H and 13C) spectroscopy. Molecular structures of guanidines 1, 4, 5 and 6 and those of 8–13 were determined by single crystal X-ray diffraction. The Pd(II) atom in 8–10
ñ -芳基- Ñ ',Ñ “ -二(吡啶-2-基) -和ñ -芳基- Ñ ',Ñ ” -双(6-甲基吡啶-2-基)胍(1 - 4和5 - 7)分离出的产率为75%–81%。Pd(OAc)2与胍2 – 7的反应分别在60°C的甲苯中进行3 h,得到8 – 13的产率分别为69%– 80%。化合物1 - 13通过元素分析进行表征,HR-MS,IR和NMR(1 H和13C)光谱学。胍的分子结构1,4,5和6和那些的8 - 13通过单晶X射线衍射来确定。将Pd(II)原子在8 - 10显示反式几何而在11 - 13显示顺式几何形状。DFT计算是针对模型化合物9a(反式)及其假设的顺式异构体9b和12a(顺式)及其假设进行的反式异构体12b表示9a / 9b对之间的能量差很小(1.28 kcal / mol),而CH 2 Cl 2中的12a / 12b对之间的能量差很大(26.38 kcal / m