... Journal of ... of Organic Chemistry “A. Mangini”, University of Bologna, V. Risorgimento 4, 40136 Bologna, Italy, and Instituto de Investigaciones Quimicas (CSIC-Use), Isla de la Cartuja, Americo Vespucio s/n, 41092 Seville, Spain rph@alu.ua.es; ricci@ms.fci.unibo.it. J. Org. Chem. ...