Chiral phosphine ligands modified by crown ethers: An application to palladium-catalyzed asymmetric allylation of β-diketones
Chiral ferrocenylphosphine ligands modified by monoaza or diaza crown ethers of varying ring sizes and linker chain lengths (8a-e, 9) were synthesized. The reaction of the phosphine ligand modified by monoaza-18-crown-6 (8b) and the di-μ-chlorobis(T-allyl