The aldonitirone function of N-(p-dimethylaminophenyl)-α-(1-oxido-2-pyridyl) nitrone (I) was shown to undergo facile rearrangement with various reagents, such as sulfur dioxide, thionyl and sulfuryl chloride, phosphorus trichloride, phosphoryl chloride, triphenyl phosphate, and acetic anhydride. To elucidate some of these rearrangement, a cyclic mechanism was postulated.
