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
Hydrogen Isotope Exchange with Iridium(I) Complexes Supported by Phosphine-Imidazolin-2-imine P,N Ligands
作者:Kristof Jess、Volker Derdau、Remo Weck、Jens Atzrodt、Matthias Freytag、Peter G. Jones、Matthias Tamm
DOI:10.1002/adsc.201601291
日期:2017.2.20
phosphine‐imidazolin‐2‐imine RP,NR′ ligands (R=Ph, Cy, i‐Pr, t‐Bu; R′=Me, i‐Pr) were prepared from 1,2‐dibromobenzene by palladium‐catalyzed C–N coupling with 1,3,4,5‐tetramethylimidazolin‐2‐imine or 1,3‐diisopropyl‐4,5‐dimethylimidazolin‐2‐imine, followed by lithiation with tert‐butyllithium and reaction with the chlorophosphines (R2PCl). Their reaction with the dimeric iridium complex [Ir(cod)Cl]2 (cod=1
commercially available Burgess catalyst in hydrogenisotopeexchange reactions with several substrates bearing different directing group functionalities and have obtained moderate to high (50%-97%D) deuterium incorporations. The broad applicability in hydrogenisotopeexchange reactions makes the Burgess catalyst a possible alternative compared to other commercially available iridium(I)-catalysts.