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Abstract
2-(Diethylphosphonate)-nitrosopropane (DEPNP), prepared by oxidation of the corresponding aminophosphonate, was found to essentially exist as monomer in both water and organic solvents. The mechanisms of its degradation under 80°C heating or visible light exposure were studied by EPR spectroscopy: its decomposition gave rise to paramagnetic by-products, which have been identified as DEPNP / ·C(CH3)2[P(O)(OC2H5)2] and DEPNP / ·P(O)(OC2H5)2 spin adducts. Despite this drawback, DEPNP was successfully used as spin trapping agents to scavenge various carbon — and phosphorus-centred free radicals both in aqueous and organic media, giving rise to intense EPR spectra characteristic of the species trapped.