Zirconium amine-donor ligands

Zirconium and hafnium complexes of an amine bis(phenolate) ligand with a THF side-arm donor have been shown to perform living polymerization of 1-hexene when activated with B(C6F5)3. The Zr catalysts (1) possess very high activities of 21 OOOgnunol cath. In neat olefin, the reaction is very exothermic and accompanied by various termination processes resulting in a higher polydispersity index than observed when the monomer is diluted in chlorobenzene. 

Tshuva, E. Y Goldberg, L Kol, M. Weitman, H. Goldschmidt, Z. Novel zirconium complexes of amine bis(phenolate) ligands. Remarkable reactivity in polymerization of 1-hexene due to an extra donor arm. Chem. Commun. 2000, 379-380. 

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