1. Department
of Chemistry, University of Rome “La Sapienza”, P.le
Aldo Moro 5, I-00185 Rome, Italy
2. CQC,
Department of Chemistry, Faculty of Science and Technology, University of Coimbra, Rua Larga, P 3004-535 Coimbra, Portugal
3. Institut
für Organische Chemie, Universität Tübingen, Auf
der Morgenstelle 18, D-72076 Tübingen, Germany