The [Zr(N{SiMe3}2)3]+ cation as a novel initiator for carbocationic isobutene homo- and isobutene/isoprene co-polymerisations

Abstract

Methyl abstraction of ZrMe{N(SiMe3)2}3 with B(C6F5)3 gives the cationic zirconium amide complex [Zr{N(SiMe3)2}3]+ which acts as an initiator for the carbocationic polymerisation of isobutene and for isobutene-isoprene copolymerisations. High molecular weight homo- and co-polymers are obtained at temperatures up to −30°C. Molecular weights are less temperature dependent than in metal halide initiated systems.