ChemInform Abstract: Ligand-Induced Selective Stabilization of the Anti Isomer in (η3-Allyl)palladium Complexes: An Attempt to Control the E-Z Stereochemistry in Palladium-Promoted Allylic Substitutions.

ChemInform Abstract

Pd-Complexes such as (I) or (VI) are prepared from the η3-allyl-chloride complexes, AgBF₄, and the dimethylphenanthroline component. In contrast to the usual preponderance of the syn configuration in (η3-allyl)Pd complexes, it is found that, in comparison with the anti isomers (Ib), (VIb), the syn isomers (Ia), (VIa) are the less stable ones. As it can be seen from the scheme, a high control of the E/Z stereochemistry is exerted in allylic substitution reactions of (I) or (VI) with nucleophiles such as (II) or (VII).