Novel Trityl Activators with New Weakly Coordinating Anions Derived from C6F4-1,2-[B(C6F5)2]2: Synthesis, Structures, and Olefin Polymerization Behavior

The weakly coordinating anions {C 6 F 4 -1,2-[B(C 6 F 5 ) 2 ] 2 (μ-OR)} - (R = CH 3, C 6 F 5 ) were prepared as their trityl salts ( 2-OR ) and fully characterized. Stoichiometric reactions with Cp 2 ZrMe 2 yield dimeric ( 3-OR ) or monomeric ( 4-OR ) metallocenium ions; the latter are highly effective cocatalysts for ethylene polymerization.