Ym. Sun et al., Al-, Nb-, and Ta-based perfluoroaryloxide anions as cocatalysts for metallocene-mediated Ziegler-Natta olefin polymerization, ORGANOMETAL, 19(9), 2000, pp. 1625-1627
Perfluoroaryloxide salts of the formula Ph3C+-Al(OC6F5)(4)(-) and Ph3C+M(OC
6F5)(6)(-) (M = Nb, Ta) have been synthesized and characterized. In combina
tion with sterically encumbered zirconocene dimethyl complexes, they yield
active ethylene polymerization catalysts.