Cationic polymerization of isobutylene in toluene: toward well-defined exo-olefin terminated medium molecular weight polyisobutylenes under mild conditions

Abstract

Medium molecular weight polyisobutylenes (∼35 000 g mol⁻¹) with <italic>exo</italic>-olefin end groups (&gt;80%) can be obtained by cationic polymerization of isobutylene in toluene using ⁱBu₂AlCl or ⁱBuAlCl₂·<italic>n</italic>OR₂ (<italic>n</italic> = 0.6–0.8) as co-initiators.