Hydrogenation of heteroaromatic nitriles and aromatic dinitriles by heterogeneous or homogeneous ruthenium catalysts derived from [Ru 3 (CO) 12 ]
作者:Juventino J. García、Nora Pérez-Lezama、Alma Arévalo
DOI:10.1016/j.ica.2017.04.051
日期:2017.8
The use of the complex [Ru-3(CO)(12)] (1) as a catalyst precursor (0.1 mol%) at 200 degrees C, 60 psi of H-2, along with triphenylphosphine (TPP) generated ruthenium nanoparticles (Ru-Nps); this occurred in the presence of pyridine-nitriles leading to a variety of hydrogenation (secondary amine, imine, or imidazole) products, depending of the pyridine-nitrile used, under similar reaction conditions. This relates to relatively good to modest yields, determined by the substituents in the corresponding pyridine. In sharp contrast, the use of aromatic dinitriles did not generate Ru-Nps at 140 degrees C, 150 psi of H-2 and TPP, but allowed the homogeneous catalytic hydrogenation of the 1,4- and 1,3-dicyanobenzenes, to yield the corresponding CN-substituted secondary amine or imine. The main products were characterized by different analytical methods and spectroscopic techniques. (C) 2017 Elsevier B.V. All rights reserved.