Synthesis, Characterization of Rare Earth Metal Bis(Amide) Complexes Supported by Ferrocene-substituted Amidinate/cyclopentadienyl Ancillary Ligands and Their Catalysis in Isoprene Polymerization
A series of neutral rare earth metal bis(amide) complexes supported by the ferrocene-substituded amidinate and 2-ferrocenyl-1,3,4,5-tetramethylcyclopentadierie ligands were synthesized and well-characterized. The neutral rare earth metal bis(amide) complexes could serve as cationic catalyst precursors for the selective polymerization of isoprene.1. Amine elimination of rare earth metal tris(amide) complexes with 1 equivalent of FcC(NCy)NHCy (Fc=-(η5-C5H4)Fe(η5-C5H5), Cy=-C6H11) in toluene at room temperatur...