Amine derivatives, oxidation half-wave

No.b Amine Derivative Oxidation Half-Wave Potential (SCE)... 

The amine derivatives used are listed in Table II together with their oxidation half-wave potentials. The ratio of the tensile strength of aged (TS) to unaged (TS)0 rubber is used as a measure of the degree of oxidative degradation (see Figures 5-8). 

Fig. 31. Relation of half-wave potentials (at pH 11) for the oxidation of cyclic -phenylenediamines to half-wave potentials in 0.1 M NaOH for the reduction of nitrosamines derived from the same cyclic amines...

Since the latter are useful sources of pyridine derivatives, methods for their deoxygenation have been much studied. These compounds lack the oxidizing properties found with some amine oxides. Polarographic studies show that in acid media pyridine 1-oxide has a much lower reduction potential than oxides of tertiary amines with exocyclic nitrogen atoms -. The half-wave potentials are not useful guides to the abilities of the N-O bonds in pyridine oxides to take part in oxygen transfer reactions, and in 4-nitropyridine 1-oxide the nitro group is reduced first . 

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