摘要:
An alkyl abstraction from (DIP-pyr)Zr(CH2Ph)(3) (DIP-pyr = 2-{N-(2,6-diisopropylphenyl)iminomethyl}pyrrolyl) using Al(C6F5)(3) affords a zwitterionic dibenzyl complex, [(DIP-pyr) Zr(CH2Ph)(2)][eta(6)- PhCH2Al(C6F5)(3)] (2), which becomes an active catalyst for 1-hexene polymerization. The similar reaction by using B( C6F5) 3 affords a less stable adduct. The more stable character of 2 is ascribed to the tight ion-pair formation between the zirconium cation and the benzyl aluminate anion.