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I can't seem to find any resource online that describes the arrow pushing mechanism behind the oxidation of Cu(I) by ammonium nitrate in acid.

Does a radical oxygen form? Or does it require both copper atoms simultaneously? I've drawn out a few possible mechanisms, but all seem plausible...

Here is the mechanistic formula:

$$\ce{2Cu(I) + 2H+ + NH4NO3 -> 2Cu(II) + H2O + NH4NO2 -> 2Cu(II) + N2 + 3H2O}$$

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