Highly Reactive Polyisobutenes Prepared with Manganese(II) Complexes as Initiators


  • The Fonds der Chemischen Industrie and the Deutsche Forschungsgemeinschaft (DFG; Ph.D. grant to Y.Z) are acknowledged for financial support, and Dr. G. Langstein and Dr. W. Obrecht (BAYER AG) for helpful discussions. We are particularly grateful to the BAYER AG for continuous financial support and for permission to publish.


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The end of the Ice Age? Polyisobutenes with a high content of olefinic terminal groups can be synthesized by the use of manganese(II) initiators in homogeneous solution. These easily accessible complexes (see structure) initiate at room temperature, rather than at the sub-zero temperatures usually required, and allow the formation of highly reactive, gel-free polyisobutenes with a high viscosity. Furthermore, the initiators were successfully used for the copolymerization of isobutene with isoprene.