Synthesis and Characterization of Yttrium Complexes Containing a Tridentate Linked Amido−Cyclopentadienyl Ligand

The reaction of dilithium salts of the tridentate linked amido−cyclopentadienyl ligands Li 2 (C 5 Me 4 SiMe 2 NCH 2 CH 2 X) (X = OMe, NMe 2, CH 2 OMe) with [Y( o -C 6 H 4 CH 2 NMe 2 )Cl 2 (LiCl)(THF) 4 ] and Y(η 5 -C 5 H 5 )Cl 2 (THF) 3 give chloro-bridged ate complexes of the type [Li(THF)][Y(η 5:η 1 -C 5 Me 4 SiMe 2 NCH 2 CH 2 X)(R)Cl], where R = o -C 6 H 4 CH 2 NMe 2, η 5 -C 5 H 5 .