Abstract
In cationic Rh[( R, R)-1,4-bis(diphenylphosphino)butane-2,3-diol] complexes the interaction of the hemilabile coordinating hydroxy groups with the metal is strongly dependent upon the nature of the counter-ligand and the solvent. As a result of the `arm-off, arm-on' mechanism the conformation of the chirality inducing backbone is changed. Spectroscopic and catalytic investigations demonstrate that the η 3-coordination mode of the tetradentate ligand is responsible for the deceleration of the asymmetric hydrogenation. By the assistance of the second HO-group the Rh–O interaction can be suspended.
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