Application of neutral iridium(I)<i>N</i>-heterocyclic carbene complexes in<i>ortho</i>-directed hydrogen isotope exchange
作者:Alison R. Cochrane、Stephanie Irvine、William J. Kerr、Marc Reid、Shalini Andersson、Göran N. Nilsson
DOI:10.1002/jlcr.3084
日期:2013.7
Bench-stable complexes of the type [Ir(COD)(NHC)Cl] (NHC = N-heterocyclic carbene) have been investigated within the field of hydrogenisotopeexchange. By employing a sterically encumbered NHC within such complexes and catalyst loadings of only 5 mol%, moderate to high deuterium incorporations were achieved across a range of aromatic ketones and nitrogen-based heterocycles. The simple and synthetically
could be labeled efficiently. With the addition of tris(pentafluorophenyl) borane to the reaction mixture, also highly deactivating nitrile substituents were well tolerated in the reaction. Based on the excellent results obtained with the chiral ThrePhox ligand, a structurally simpler, achiralligand was developed. The iridium complex containing this ligand, proved to be a powerful catalyst for HIE reactions
Cp*Co(III)‐Catalyzed C−H Alkenylation of Aromatic Ketones with Alkenes
作者:Md Raja Sk、Sourav Sekhar Bera、Modhu Sudan Maji
DOI:10.1002/adsc.201801385
日期:2019.2
Cost‐effective and air‐stable high‐valent cobalt(III)‐catalyzed weakly coordinating, ketone‐directed regioselective mono‐alkenylation of arenes and heteroarenes with alkenes is demonstrated. Various electron‐rich and electron‐deficient arenes are tolerated under the reaction conditions, providing E‐alkenylated products exclusively. The tert‐butyl‐acrylates serve as an acrylic acid surrogate to provide
A method for the selectivedeuteration of polyfunctional organic molecules using catalytic amounts of [RuCl2 (PPh3 )3 ] and D2 O as a deuteriumsource is presented. Through variation of additives like CuI, KOH, and various amounts of zinc powder, orthogonal chemoselectivities in the deuteration process are observed. Mechanistic investigation indicates the presence of different, defined Ru-complexes
Highly active iridium(i) complexes for catalytic hydrogen isotope exchange
作者:Jack A. Brown、Stephanie Irvine、Alan R. Kennedy、William J. Kerr、Shalini Andersson、Göran N. Nilsson
DOI:10.1039/b715938b
日期:——
Practically convenient methods have been developed for the preparation of new iridiumcomplexes, possessing bulky N-heterocyclic carbene and phosphine ligands; these routinely handled complexes are highly active catalysts within directed hydrogenisotopeexchange processes.