Neutral Tripodal Amidozirconium Alkyls and Hydride. Synthesis, Structures, and Catalytic Olefin Insertions

Synthesis, structural characterization, and preliminary reactivity studies of the title compounds are reported. The ethylene polymerization and diene cyclization activities that these complexes have shown are unprecedented for neutral molecules of the type X₃MR (X = amide, alkoxide, or siloxide; M = group 4 metal; R = alkyl or hydride).