The aluminocemium cation [Al(C5H5)2]+: A highly effective initiator for the cationic polymerization of isobutene

Article abstract of DOI:10.1002/anie.199622261

On the last hitherto unknown simple metallocenes, the aluminocenium cation [Al(η-C₅H₅)₂]⁺ 1, is readily accessible from [AlCp₂Me] and B(C₆F₅)₃. The spectroscopic data are consistent with a metallocene structure. The complex is a highly efficient initiator for the carbocationic polymerization of isobutene and the industrially important copolymerization of isobutene and isoprene.