Efficient Transfer Hydrogenation Using Iridium and Rhodium Complexes of Benzannulated N-Heterocyclic Carbenes


TÜRKMEN H. , PAPE T., HAHN F. E. , CETINKAYA B.

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, ss.5418-5423, 2008 (SCI İndekslerine Giren Dergi) identifier identifier

  • Basım Tarihi: 2008
  • Doi Numarası: 10.1002/ejic.200800715
  • Dergi Adı: EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
  • Sayfa Sayıları: ss.5418-5423

Özet

Benzimidazol-2-ylidene(NHC) derivatives of iridium(I) and rhodium(I) hearing electron-rich and/or functional substituents R and R' at the nitrogen atoms of the heterocycle [IrBr(cod)(NHC)] (a) or [RbBr(cod)(NHC)] (b) (R = 2,3,5,6-tetramethylbenzyl; R' = methoxyethyl, 1a,b; R = R' = 2,3,5,6-tetramethylbenzyl, 2a,b; R = pentamethylbenzyl, R' = methoxyethyl, 3a,b; R = R' = pentamethylbenzyl, 4a,b) were prepared. All compounds were fully characterized by (1)H and (13)C NMR spectroscopy, mass spectrometry (MALDI), and elemental analysis. In addition, the molecular structures of la, 2a, and 3a were determined by single-crystal X-ray diffraction studies. All of: the new benzimidazol-2-ylidene iridium(I) and rhodium(I) complexes were found to be effective catalysts for transfer hydrogenation with iridium(I) derivative la showing the highest catalytic activity, ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)