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N-Nitrosamines form rapidly from NO and secondary amines in the presence of AgI salts via amino radical cation intermediates derived from AgII-amine complexes.WE have shown1 that NO is an ineffectual reagent for the N-nitrosation of amines in the absence of either oxygen or iodides including iodine itself. Activation by oxygen results from the formation of either N,O, or N,O,la and by iodides from the formation of NOI.l1, Other work has shown that the N-nitrosation of amines by NO may also be catalysed by CuII and FelII salts., These reactions, which

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