Abstract
Abstract Phosphine–imidazoline ligands 8, and the derivatives 16 and 17, which have electron-withdrawing or electron-donating groups in the aminic nitrogen, were synthesized from 2-aryl-imidazolines, which have previously been obtained from dithioesters. The coordination of ligand 8 to Ir(I) was studied and the molecular structure of the [Ir(η4-COD)8]BF4 (COD = 1,5-cyclooctadiene) determined through X-ray diffraction. The in situ prepared Ir(I)/phosphine–imidazoline catalysts were tested in the asymmetric hydrogenation of ketimines in order to evaluate the influence of the electronic parameters of the ligand on the catalytic reaction.
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