1192371-33-7Relevant articles and documents
Expanded ring and functionalised expanded ring N-heterocyclic carbenes as ligands in catalysis
Binobaid, Abeer,Iglesias, Manuel,Beetstra, Dirk J.,Kariuki, Benson,Dervisi, Athanasia,Fallis, Ian A.,Cavell, Kingsley J.
experimental part, p. 7099 - 7112 (2010/02/15)
The synthesis of new functionalised 6- and 7-membered NHC (N-heterocyclic carbene) precursors bearing anisidyl or pyridine N-substituents, both symmetrically and non-symmetrically substituted is reported. Their corresponding rhodium(i) and iridium(i) complexes, M(COD)(NHC)Cl, were also prepared and characterised. The unusual Rh(iii)/Rh(i) salt, [Rh(η2-NHC-py) 2Cl2][Rh(COD)Cl2], was obtained with one of the pyridyl-functionalised NHC ligands. Single-crystal X-ray analyses have been obtained for the majority of the complexes and NHC salts. The activity of these complexes was tested in the hydrogenation of a range of substrates with molecular hydrogen, including 1-cyclooctadiene and 2-methyl styrene, where they show enhanced activity and stability in comparison to non-functionalised NHC analogues, operating under exceptionally mild conditions (ambient temperature and atmospheric pressure).