1. Research Group for Petrochemistry, Hungarian Academy of Sciences, 8200 Veszprém, Hungary
2. Chimie, Biologie et Radicaux Libres, UMR CNRS 6517, Faculté des Sciences et Techniques, case 432, Université Paul Cézanne Aix‐Marseille III, Avenue Escadrille Normandie‐Niemen, 13397 Marseille Cedex 20, France, Fax: +33‐491‐983‐208
3. Department of Organic Chemistry, University of Veszprém, 8201 Veszprém, Hungary
4. Department of Inorganic and Analytical Chemistry, Faculty of Science, University of Debrecen, 4010 Debrecen, Hungary