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.

Metal--Metal "Communication" of Rh or Pd with Nd in Novel Heterobinuclear Complexes.

The reaction of a neodymium "ate" complex and an electron-rich transition metal chloride by salt elimination is an efficient method for synthesizing heterobinuclear compounds which contain a lanthanide and a Group 9 or 10 metal [Eq. (1), H Ap=2-amino-4-methylpyridine]. The use of bisaminopyridinato ligands allows extremely short distances between Rh or Pd and Nd.

Yttrate-Mediated Ligand Transfer and Direct Synthesis as a Route to Amidopalladium Complexes.

A ligand transfer from yttrium to palladium and the regeneration of 1 are the crucial steps in the efficient synthesis of the very strained amidopallium complex 2 from [(cod)PdCl ] and 1 (cod=cyclooctadiene). In the light of the numerous "ate" complexes of early transition metals, this synthetic route should have enormous potential.