Ethyl-Zinc(II)-Cation Equivalents: Synthesis and Hydroamination Catalysis

摘要

Ion-like ethylzinc(II) compounds with weakly coordinating aluminates Al(ORF)(4)(-) and ((RO)-O-F)(3)Al-F-Al(ORF)(3)(-) (R-F=C(CF3)(3)) were synthesized in a one-pot reaction and fully characterized by single-crystal X-ray diffraction, NMR and vibrational spectroscopy, and by quantum chemical calculations. The catalytic activity of ion-like Et-ZnAl(ORF)(4) in intermolecular hydroamination and in the unusual double hydroamination of anilines and alkynes was investigated. Favorable performance was also found in comparison to the Et2Zn/ PhNMe2H(+)B(C6F5)(4)(-) system generated in situ at lower catalyst loadings of 2.5mol.