Molybdenum(III) Compounds as Catalysts for 2-Methylpropene Polymerization (pages 7290–7292)
Ahmed K. Hijazi, Narayanan Radhakrishnan, Kavita R. Jain, Eberhardt Herdtweck, Oskar Nuyken, Hans-Michael Walter, Phillip Hanefeld, Brigitte Voit and Fritz E. Kühn
Version of Record online: 20 JUN 2007 | DOI: 10.1002/anie.200700748
Environmentally benign polymerization: Highly reactive polyisobutenes can be synthesized with MoIII catalysts (see picture; Mo red, N blue, Cl green, C black) at room temperature in nonchlorinated solvents. This is a major improvement in comparison to the industrial process, which is carried out below 0 °C in solvents like CH2Cl2. Other recently found catalysts could not be applied in chlorine-free solvents and were considerably less efficient.