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Efficient Transfer Hydrogenation Using Iridium and Rhodium Complexes of Benzannulated N‐Heterocyclic Carbenes
Author(s) -
Türkmen Hayati,
Pape Tania,
Hahn F. Ekkehardt,
Çetinkaya Bekir
Publication year - 2008
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200800715
Subject(s) - iridium , chemistry , rhodium , catalysis , transfer hydrogenation , derivative (finance) , mass spectrometry , medicinal chemistry , crystal structure , single crystal , stereochemistry , crystallography , polymer chemistry , organic chemistry , ruthenium , chromatography , financial economics , economics
Benzimidazol‐2‐ylidene(NHC) derivatives of iridium(I) and rhodium(I) bearing electron‐rich and/or functional substituents R and R′ at the nitrogen atoms of the heterocycle [IrBr(cod)(NHC)] ( a ) or [RhBr(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 1a , 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 1a showing the highest catalytic activity.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)