Structure and reactivity of cis- and trans-bis-[{5-carbomethoxy-(1,2,3-η)-cyclohexenyl}palladium]. Evidence for a (σ-allyl)palladium intermediate in the cis-migration of acetate from palladium to coordinated π-allyl

Abstract

The mode of attack by acetate on a (π-allyl)palladium complex depends not only on the ligands on palladium, but also on the structure of the complexes; for the bis-[{5-carbomethoxy-(1,2,3-η³)-cyclohexenyl}palladium] complexes, the structures of which were determined by X-ray crystallography and NMR spectroscopy, the cis isomer preferably reacted by external attack whereas the trans isomer, under identical conditions, preferred internal migration.