Abstract
The reaction of 2, 6-disubstituted-4-chloropyrimidines (I) with hydrogen peroxide in acetic acid does not afford their N-oxides but results in the rearrangement of chlorine to give 2, 6-disubstituted-5-chloro-4-pyrimidones (II). The preparation of chloropyrimidine N-oxides (IV) is successful when mono-permaleic acid is used as an oxidizing reagent.
