The major product from reaction of 5-acetoxy-or 5-methoxy-1,2,3-trimethoxybenzene with nitric acid in acetic anhydride is 2,6-dimethoxyquinone, via the moderately stable 3,4,5-trimethoxy-4-nitrocyclohexa-2,5-dienone as common intermediate.
B. A. Collins, K. E. Richards and G. J. Wright, J. Chem. Soc., Chem. Commun., 1972, 1216a DOI: 10.1039/C3972001216A
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