Novel N,S- and N,Se-planar chiral [2,2]paracyclophane ligands: synthesis and application in Pd-catalyzed allylic alkylation

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Novel N,S- and N,Se-ligands with planar chirality derived from [2.2]paracyclophane have been synthesized and applied in palladium-catalyzed allylic alkylation reaction, in which ligands 5 and 9 with the two substituents at benzylic and benzene ring positions give the highest ee values.