Synthesis and characterization of group 5 imido complexes supported by the 2,6-dichloroaryl β-diketiminato ligand

New niobium and tantalum imido complexes supported by the bis-N,N-(2,6-dichlorophenyl)-β-diketiminate ligand (BDICl) are reported. (BDICl)M(NtBu)Cl2py (1: Nb, 2: Ta) were used as precursors for the formation of the dimethylated complexes (BDICl)M(NtBu)Me2 (3: M = Nb, 4: M = Ta). Tantalum dialkyl imido complexes (BDICl)Ta(NtBu)Bn2 (5) and (BDICl)Ta(NtBu)(CH2SiMe3)2 (6) were prepared and characterized by NMR spectroscopy.65