1. Contribution from the LCOM, Equipe de Recherches “Oxydation et Formulation”, UMR CNRS 8009, ENSCL BP 108, F-59652 Villeneuve d’Ascq Cedex, France, Institute of Organic Chemistry, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany, and Department of Chemistry, Facundo Bueso 110, University of Puerto Rico, Rio Piedras, PR 00931