Studies On Chiral Rare Earth Complexes Supported By Ethylene-bridged Cyclohexylamino-fluorenyl Ligand: Syntheses, Structures And Catalytic Performance

The ethylene-bridged(1R,2R)-2-(dimethylamino) cyclohexylamino-fluorenyl ligand(L) has been synthesized. Some new chiral rare earth complexes(η5:η1:η1-L)RE[N(SiMe3)2], RE=Y(1), La(2), Nd(3), Sm(4), Dy(5), Er(6), Yb(7), Lu(8) were obtained by treatment of [(Me3Si)2N]3RE(μ-Cl)Li(THF)3 with 1equiv of L. All complexes were characterized by elemental analysis, the structures of complexes 1, 2, 4, 5, 7 and 8 were established by single-crystal X-ray diffraction, and the complexes 1,4,8 can be determined by NMR. Through catalytic the hydroamination of aminoalkenes and the cyanosilylation of ketones to study these complexes catalytic performance. The experimental results showed that the complexes can catalytic these reactions, but didn’t function in chiral induction.