2-Unsubstituted 1-pyrroline 1-oxides are rapidly oxidised by iron(III) chloride solutions to yield hydroxamic acids, whilst 2-substituted 1-pyrroline 1-oxides are much more difficult to oxidise. Cyclic hydroxylamines are oxidised as readily as the 1-pyrroline 1-oxides and also yield hydroxamic acids.
J. F. Elsworth and M. Lamchen, J. Chem. Soc. C, 1966, 1477 DOI: 10.1039/J39660001477
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