Nitration of 1,2-dimethyl-4-nitrobenzene in a mixture of acetic and trifluoroacetic anhydrides gives the adduct 4,5-dimethyl-2,4-dinitrocyclohexa-2,5-dienyl acetate which reacts with potassium nitrite and other nucleophiles to give 1,2-dimethyl-4,5-dinitrobenzene.
A. Fischer and L. M. Iyer, J. Chem. Soc., Chem. Commun., 1979, 1096 DOI: 10.1039/C39790001096
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