1. Consiglio Nazionale Ricerche CNR‐ISOF, Via Gobetti 101, 40129 Bologna (Italy), Fax: (+39) 051‐6398349
2. Mediteknology srl Via Gobetti 101, 40129 Bologna (Italy)
3. Department of Chemistry 'G.Ciamician', University of Bologna, Via F. Selmi 2, 40122 Bologna (Italy)
4. Department of Organic Chemistry 'A.Mangini', University of Bologna, Viale Risorgimento 4, 40136 Bologna (Italy)