1. Department of Chemistry “Giacomo Ciamician”, University of Bologna, via Selmi 2, 40126 Bologna, Italy
2. Istituto per la Sintesi Organica e la Fotoreattività (ISOF), Consiglio Nazionale delle Ricerche (CNR), via Gobetti 101, 40129 Bologna, Italy
3. Department of Chemistry, University of Bari, via Orabona 4, I-70126 Bari, Italy
4. Department of Chemistry “Giacomo Ciamician”, University of Bologna, via San Giacomo 11, 40126 Bologna, Italy