64318 20200221144322.0 doi 10.1002/ejic.201600922 sideral 102707 ART-2016-102707 eng Aznarez, Francisco Iridium(III) Complexes Bearing Chelating Bis-NHC Ligands and Their Application in the Catalytic Reduction of Imines 2016 Access copy available to the general public Unrestricted The IrIII complexes 4 and 5 bearing bis-NHC ligands (NHC = N-heterocyclic carbene) composed of one classical NR,NR NHC and one N,NR NHC donor were prepared by the reaction of the azolium/azole compounds 2I and 3Br, respectively, with [{Cp*IrCl(µ-Cl)}2] (Cp*=¿5-C5Me5) in the presence of NaOAc as base. Most likely, the salts 2I and 3Br were first selectively deprotonated at the C2 position of the disubstituted (NR,NR) diazaheterocycle to generate an NHC donor, which then coordinated to the IrIII center. Subsequently, NaOAc promoted C–H bond activation at the pendant imidazole moiety of the intermediate IrIII mono-NHC complexes led to the formation of the six-membered iridacycles 4 and 5, which bear a chelating, doubly C-metalated C(NHC)^C(NHC') bis-NHC ligand. The IrIII complexes 4 and 5 were tested as precatalysts for the reduction of imines with molecular hydrogen. Moderate to good activity was observed at a catalyst loading of 5 mol-% and an H2 pressure of 3 bar in MeOH. info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 2.444 2016 CHEMISTRY, INORGANIC & NUCLEAR 13 / 46 = 0.283 2016 Q2 T1 0.837 2016 Inorganic Chemistry 2016 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion (orcid)0000-0003-3144-5320 Iglesias, Manuel Universidad de Zaragoza Hepp, Alexander Veit, Benjamin (orcid)0000-0002-8220-6031 Sanz Miguel, Pablo J. Universidad de Zaragoza (orcid)0000-0001-7154-7239 Oro, Luis A. Universidad de Zaragoza Jin, Guoxin Hahn, F.Ekkehardt 2010 760 Universidad de Zaragoza Dpto. Química Inorgánica Área Química Inorgánica 2016, 28 (2016), 4598-4603 Eur. j. inorg. chem. EUROPEAN JOURNAL OF INORGANIC CHEMISTRY 1434-1948 914264 http://zaguan.unizar.es/record/64318/files/texto_completo.pdf Postprint 114275 http://zaguan.unizar.es/record/64318/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:64318 articulos driver 2020-02-21-13:41:57 ARTICLE