Selective hydrogenation of the CO bond of ketones using Ni(0) complexes with a chelating bisphosphine
                                
                                    
                                        作者:Areli Flores-Gaspar、Paulina Pinedo-González、Marco G. Crestani、Miguel Muñoz-Hernández、David Morales-Morales、Brian A. Warsop、William D. Jones、Juventino J. García                                    
                                    
                                        DOI:10.1016/j.molcata.2009.05.026
                                    
                                    
                                        日期:2009.8
                                    
                                    The nickel complexes [(dippe)Ni(eta(2)-O,C-benzophenone)] (2), [(dippe)Ni(eta(2)-O,C-4-methylbenzophenone)] (3), [(dippe)Ni(eta(2)-O,C-acetophenone)] (4), [(dippe)Ni(eta(2)-O,C-acetone)] (S), [(dippe)Ni(eta O-2,C-fluorenone)] (6), [(dippe)Ni(eta(2)-O,C-di(2-pyridyl) ketone)] (7a) [(dippe)Ni(kappa(2)-N,N-di(2-pyridyl) ketone)] (7b), [(dippe)Ni(kappa(2)-O,O-2,2'-pyridil)] (8), [(dippe)Ni(kappa(2)-O,O-benzil)] (9a), and [((dippe)Ni)(2)(eta(2)-O,C-benzil)] (9b) were prepared by the reaction of [(dippe)Ni(mu-H)](2) (1) with the corresponding ketone or 1,2-diketone at room temperature. The structures of compounds 2, 6, 9a and 9b were confirmed by X-ray crystallography. The selective hydrogenation of the two types of substrates was undertaken using H-2, giving high conversions to the corresponding reduction products, either alcohols or alkanes. Tunable reaction conditions to promote the partial or total hydrogenation (hydrogenolysis) of the substrates are described. (C) 2009 Elsevier B.V. All rights reserved.