Abstract
[1,2]- and [2,3]-Meisenheimer rearrangements have been investigated on the basis of density functional theory. When allylic group is involved in tertiary amine N-oxide, the concerted [2,3]-allylic shift is most favorable. On the other hand, in [1,2]-Meisenheimer rearrangement, calculations indicate that methyl, ethyl, isopropyl, benzyl and 3-homoadamantyl transfer all favor the radical mechanism, which is in good agreement with the experiments; while phenyl transfer prefers the concerted mechanism. Meanwhile, oxidation will facilitate the functional group transfer. Calculations show that density functional theory provides a suitable tool for explaining the Meisenheimer rearrangement mechanisms.
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