Zirconium Complexes with the New Ancillary Diamido Ligand 2,2‘-Ethylenebis(N,N‘-(triisopropylsilyl)anilinido)2-: Syntheses, Structures, and Living α-Olefin Polymerization Activities

Using the new ancillary ligand 2,2‘-ethylenebis( N,N ‘-(triisopropylsilyl)anilinido) (EBT i P, 1 ), the zirconium complexes (EBT i P)ZrCl 2 ( 2 ) and (EBT i P)ZrMe 2 ( 3 ) have been prepared. X-ray crystal structures and 1 H NMR spectra of 2 and 3 reveal that they both have a C 2 -symmetric conformation. Complexes 2, activated by MAO, and 3, activated by either MAO or B(C 6 F 5 ) 3, are good catalysts for the polymerization of terminal olefins. In particular, the polymerization of 1-hexene catalyzed by 3 /B(C 6 F 5 ) 3 at low temperature is living.