Abstract:A series of palladium(II) pincer complexes with dif-ferent substituents on the amine donor has been prepared and studied in olefin isomerization cataly-sis. Installing a macrocycle into the pincer ligand enables cation-switchable positional olefin isomer-ization: no reaction is observed with the catalyst alone, while in the presence of Li+ salts isomeriza-tion proceeds cleanly. Mechanistic studies implicate a key role of highly electrophilic Pd centers with accessible olefin binding sites in catalysis.
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