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Until now, very little is known about the mechanistic details of the reduction reaction of this type of radicals. Thus, deoxygenating of nitronyl nitroxides can take place by reaction with triphenylphosphine, gaseous NO or nitrides and acids may induce a disproportionate-deoxygenating process of the radical. Since common chlorinated solvents always contain traces of acidic impurities, this may be the reason why reduction occurs on long standing of crystallization samples. Also higher reaction temperatures or an excess of the metal salt seem to favor the reduction, although no reaction products of the metals were identified: long standing of crystallization samples
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