31P-Labeled Pyrroline N-Oxides: Synthesis of 5-Diethylphosphone-5-methyl-1-pyrroline N-Oxide (DEPMPO) by Oxidation of Diethyl (2-Methylpyrrolidin-2-yl)phosphonate - Barbati, Stéphane; Clément, Jean-Louis; Fréjaville, Claudine; Bouteiller, Jean-Claude; Tordo, Paul; Michel, Jean-Claude; Yadan, Jean-Claude (Synthesis, 1999)