Abstract
The aromatization of cyclohexane-1,2-dione dioxime (nioxime), 4-methylcyclohexane-1,2-dione dioxime and nickel (II)bis(N,N′-4-methylcyclohexane-1,2-dione dioximate) takes place in polyphosphoric acid (PPA) to the corresponding o-phenylenediamine derivatives. The mechanism is analogous to the Semmler-Wolff aromatization. Aromatization, in addition to the normal Beckmann rearrangement, takes place with cyclohexane 1,4-dione dioxime in both conc and fuming sulfuric acids.
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