Abstract
AbstractNew, chiral bis(imidazol‐2‐ylidene) ligands, and their rhodium(I) and iridium(I) complexes, have been prepared by a simple six‐step synthesis starting from commercially available enantiomerically pure L‐valinol. The stepwise introduction of the imidazoles makes it possible to create chiral bis(NHC) complexes with different substituents at the terminal nitrogen atoms. Formation of IrI and RhI complexes by a one‐pot transmetallation reaction gives the endo and exo stereoisomers in different ratios, depending on the metal and the reaction conditions. Diastereomerically pure material was obtained by crystallisation.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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