Ethylene homo- and copolymerization activity of a series of [ONNO]-type amine bis(phenolate) based vanadium(II-V) catalysts

The synthesis and structural characterization of new paramagnetic amine bis(phenolate) [ONNO]-vanadium(III) and -vanadium(II) complexes, V-III(acac)[ONNO], V-III(cl) (THF)[ONNO], and V-II(TMEDA)[ONNO], is described. These compounds complete the family of [ONNO]-vanadium(IV/V) complexes previously reported. The members of the [ONNO]-vanadium family at various oxidation states that range from vanadium(II) to vanadium(v), in association with EtAlCl2 cocatalyst, were studied in the polymerization of ethylene and in the copolymerizations of ethylene-1-hexene and ethylene-norbornene. Poly(ethylene-co-1-hexene) and poly(ethylene-co-norbornene) were produced with co-monomer content of up to 11 mol-% and 29 mol-% for 1-hexene and norbornene, respectively. (c) Wiley-VCH Verlag GmbH & Co.