Novel Amidoniobium Complexes with a Functional Relationship to the [Cp ZrR] Ion.

Partial abstraction of apical methyl groups is observed in aminopyridinatoniobium alkyne complexes, as exemplified with the synthesis and characterization of 1. This results in cationic complex fragments, which facilitate the polymerization of ethylene and in the presence of methylalumoxane the selective dimerization of 1-butene.