1. Institut für Organische Chemie and Center for Nanosystems Chemistry; Universität Würzburg; Am Hubland 97074 Würzburg Germany
2. Departamento de Química Orgánica; Facultad de Ciencias; Universidad Autónoma de Madrid; 28049 Madrid Spain
3. School of Chemistry and Chemical Engineering; Queen's Universtity Belfast; Stranmillis Road Belfast BT9 5AG United Kingdom
4. São Carlos Institute of Chemistry; University of São Paulo, A; v. Trab. São-Carlense, 400 13560-970 São Carlos-SP Brazil
5. Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstrasse 40 48149 Münster Germany