title: Synthesis of the new, weakly coordinating anions [RB(C6F5)3]- (R = CH2Me, CHMe2, CH2CMe3); utilization of [HNMe2Ph][Me3CCH2B(C6F5)3] to activate zirconocene catalysts for propylene polymerization.
abstract: The compound [HNMe2Ph][NpB(C6F5)3](Np =(CH3)3CCH2) reacts with dimethylzirconocenes to give active propylene polymerization catalysts which are significantly more active and give higher molecular weight polypropylene than do the catalysts obtained using B(C6F5)3; the [NpB(C6F5)3]- anion is for steric reasons more weakly coordinating than is [MeB(C6F5)3]-.
authors.affiliation: Department of Chemistry, Queen's University, Kingston, Ontario, CanadaK7L 3N6. bairdmc@chem.queensu.ca.
authors.forename: Neda
authors.initials: N
authors.lastname: Bavarian
authors.forename: Michael C
authors.initials: MC
authors.lastname: Baird