1. Institute of Chemical Technology II, University of Technology, 85747 München, Germany, Institute of Organic Chemistry and Technology, Cracow University of Technology, 31-155 Krakow, Poland, Faculty of Chemistry, Nicholas Copernicus University, 87-100 Torun, Poland, and Max-Planck-Institut für Kohlenforschung, 45470 Mülheim a. d. Ruhr, Germany