Ruthenium-cymene containing pyridine-derived aldiimine ligands: Synthesis, characterization and application in the transfer hydrogenation of aryl ketones and kinetics studies
作者:Thiago S. Ramos、Diego M. Luz、Rebecca D. Nascimento、Andressa K. Silva、Luciano M. Lião、Victor M. Miranda、Victor M. Deflon、Márcio P. de Araujo、Leonardo T. Ueno、Francisco B.C. Machado、Luís R. Dinelli、André L. Bogado
DOI:10.1016/j.jorganchem.2019.04.022
日期:2019.8
complexes (2)–(8) were applied as pre-catalyst in the transfer hydrogenation of the acetophenone and 4-methylacetophenone, showing good catalytic activity, with productivity up to 90%, and TOF up to 302 h−1 within 3 h of reaction; except for (8), which has no activity for the catalytic reduction performed in this work. A kinetic investigation using (3) and (7) as pre-catalysts showed that the time dependence
通过2-吡啶羧基醛与相应的取代苯胺在乙醚溶液中的存在下容易达到的缩合反应,合成了五个富电子的N N'-吡啶基嘧啶配体,这些配体在与金属中心配位时形成五元螯合环。对甲苯磺酸的催化量。在过量的KPF 6存在下,N N'-吡啶基嘧啶配体与[RuCl 2(p -cym)] 2 (1)反应导致形成通式为[RuCl(p -cym)(N)的单核加合物N')] PF 6,其中N N'= N-苯基-1-(吡啶-2-基)甲胺(Amp)(2),N-(4-氯苯基)-1-(吡啶-2-基)甲亚胺(3),N-(4-甲基苯基)-1-(吡啶-2-基)甲亚胺(Memp)(4),N-(4-叔丁基苯基)-1-(吡啶-2-基)甲亚胺(Tump)(5),N-(2,6-二乙基苯基)-1-(吡啶-2-基)甲胺(Diemp)和N- [2,6-双(丙-2-基)苯基] -1-(吡啶-2-基)甲胺(Di i pmp)(7)。此外,2-乙酰基苯甲酸酯(O