Preparation and Properties of Inclusion Compounds of η3-Allylpalladium Complexes with Cyclodextrins

Abstract

Abstract Inclusion compounds of di-μ-chloro-bis(η-allyl)dipalladium and its analogues with cyclodextrins (CDs; α-CD, β-CD, and γ-CD) were prepared. One-to-one inclusion compounds were obtained in high yields by the treatment of β- and γ-cyclodextrin with di-μ-chloro-bis(η-allyl)dipalladium and its analogues. The formation of inclusion compounds is selective. β-CD formed inclusion compounds with di-μ-chloro-bis[1-3-η-(2-methylallyl)]dipalladium in high yield, but it did not form any inclusion compounds with di-μ-chloro-bis(1-3-η-2-butenyl)dipalladium. γ-CD formed inclusion compounds with all the η3-allylpalladium complexes tested in high yields. α-CD did not form inclusion compounds with any η3-allylpalladium complexes tested. The thermogravimetric measurements show that η3-allylpalladium complexes are stabilized when they are included in the CD cavity. The inclusion compounds were characterized by 1H NMR, IR, UV, and circular dichroism spectra.