1. Department of Organic Chemistry, Slovak University of Technology, SK-81237 Bratislava, Slovak Republic, Department of Chemistry, Juniata College, 1700 Moore Street, Huntingdon, Pennsylvania 16652, IRCOF-UMR 6014 CNRS, Place Emile Blondel, Université de Rouen, F-76131 Mt-St-Aignan Cedex, France, and URCOM, EA 3221, UFR des Sciences & Techniques de l'Université du Havre, 25 rue Philippe Lebon, BP: 540, F-76058 Le Havre Cedex, France