1. Max Planck Institute for Chemical Energy Conversion Stiftstr. 34–36 45470 Mülheim/Ruhr Germany
2. Institute of Organic Chemistry RWTH Aachen University Landoltweg 1 52074 Aachen Germany
3. Institute of Technical and Macromolecular Chemistry RWTH Aachen University Worringerweg 2 52074 Aachen Germany
4. University of Jyvaskyla Department of Chemistry P. O. Box. 35 Survontie 9B 40014 Jyväskylä Finland