“…4,5,43,48 Thus, numerous variations of the original tri-dentate 2,6-bis(imino)pyridyl ligand have 65 been reported, with many of them maintaining the same [N, N, N]-metal core in the catalyst systems. 6,7,18,19,49,50 The Alt group investigated a family of bis(arylimino)pyridine iron(II) complexes bearing ω-alkenyl substituents (Scheme 10) for ethylene oligomerization and 70 polymerization. 51 Complexes bearing substituents both at the 2-and 6-positions of the iminophenyl rings only produced polyethylene, whereas if only one ortho imino group was present, the complexes produced, depending on bulk of the substituent, either oligomer/polymer mixtures or only 75 oligomeric mixtures; the reaction conditions could also affect the products formed.…”