Efficient Palladium Catalysts Containing Original Imidazolium-Tagged Chiral Diamidophosphite Ligands for Asymmetric Allylic Substitutions in Neat Ionic Liquid

New imidazolium-tagged chiral diamidophosphite ligands, (S,S)-a and (R)-b, derived from (S,S)-N,N′-dibenzyl-1,2-cyclohexanediamine and (R)-N,N′-dimethyl-1,1′-binaphthyl-2,2′-diamine, respectively, and the corresponding palladium allylic complexes of general formula [PdCl­(η³-2-Me-C₃H₄)­(κ¹P-L)]­BF₄ (1a,b) and [Pd­(η³-2-Me-C₃H₄)­(κ¹P-L)₂]­(BF₄)₃ (2a,b) were synthesized and fully characterized, including the X-ray crystal structure for 1b. These original Pd/L catalytic systems were applied in asymmetric allylic alkylation, amination, and sulfonylation using rac-3-acetoxy-1,3-diphenyl-1-propene as a substrate in neat ionic liquids, [bmim]­[PF₆] and [Pyr]­[NTf₂]. The best results in terms of enantioselectivity were obtained with the catalytic precursor 1b in [Pyr]­[NTf₂]. The catalytic phase containing 1b for the allylic amination could be recycled up to six times without significant loss of asymmetric induction.