1. Department of Organic Chemistry II (Organic Materials and Combinatorial Chemistry) University of Ulm Albert‐Einstein‐Allee 11, 89081 Ulm, Germany, Fax: (+49) 731‐502‐2840
2. Laboratory of Macromolecular and Organic Chemistry Dutch Polymer Institute Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, The Netherlands