[Not Available].
The2-and 4-formylpyridine N-oxides show, in acid medium, an abnormal reduction mechanism. The first wave, with a potential which lies in the neighbourhood of the usual value for the aldehyde group, is due to the simultaneous reduction of the N-oxide group and the carbonyl group. The second wave is due to the reduction of the N-oxide group in the presence of a hydrated aldehyde group. 3-Formyl-pyridine N-oxide is reduced normally at all pH values, with the reduction of the carbonyl group preceding that of the N-oxide group. The reduction mechanisms have been verified by controlled potential electrolysis. The hydration of the carbonyl group has been studied by polarographic and spectrophotometric methods.
Laviron
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E
Laboratoire de Polarographie Organique associé au C.N.R.S., Faculté des Sciences, Dijon, France.
Gavasso
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R