Polyhalogen-substituted N-heterocycles are converted into N-oxides in high yield by oxidation in a mixture of sulphuric acid, hydrogen peroxide, and acetic or trifluoroacetic acid.
G. E. Chivers and H. Suschitzky, J. Chem. Soc. D, 1971, 28 DOI: 10.1039/C29710000028
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