First examples of a new family of redox-functionalised chelate complexes based on a 1,1′-ferrocenediyl-bridged di(amido) ligand

Article abstract of DOI:10.1002/1099-0682(200104)2001:4<913::AID-EJIC913>3.0.CO;2-Z

Treatment of Fe[(C₅H₄)NHPh]₂ (1H₂) with M(NMe₂)₄ (3a: M = Ti, 3b: M = Zr) in benzene afforded the chelates (1)Ti(NMe₂)₂ (4) and (1)Zr(NMe₂)₂(HNMe₂) (5), respectively. Chelate 5 was cleanly oxidised by ferrocenium hexafluorophosphate in acetonitrile. Treatment of 5 with two equivalents of [Me₂NH₂]Cl (6) in benzene afforded (1)ZrCl₂(HNMe₂) (7). The chelates 5 and 7 were characterised by X-ray structure analyses. The new redox-active chelate complexes are precatalysts for the polymerisation of ethylene.