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The oxidation of 1,2,4-diazaphospholide potassium(K+[2–])with oxidants produced a neutral 1,2,4-diazaphospholyl radical(2(·))which was evidenced by formation of a spin adduct DMPO[2(·)].Radical 2(·)is liable to self-associate toward a 2(N)–2(P)dimer through N–P coupling.