Organoborane-modified silica supports for olefin polymerization: Soluble models for metallocene catalyst deactivation

RA Metcalfe, DI Kreller, J Tian, H Kim, NJ Taylor…

Index: Metcalfe, Robert A.; Kreller, David I.; Tian, Jun; Kim, Hoon; Taylor, Nicholas J.; Corrigan, John F.; Collins, Scott Organometallics, 2002 , vol. 21, # 8 p. 1719 - 1726

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Citation Number: 34

Abstract

The novel tris (organoborane) 3 was prepared from organoboranes 2 [(C6F5) 2BX: X= Cl or H) and trifunctional silsesquioxane 1 [T7O9 (OH) 3]. This compound is an effective cocatalyst for olefin polymerization in combination with Cp2ZrMe2, but 1H and 19F NMR spectroscopic studies have established that the active species is most probably [Cp2ZrMe][Me2B (C6F5) 2], formed in situ from 3 along with the novel (but inactive) silsesquioxane 5.