Reaction of 5-substituted-hemimellitenes (1,2,3-trimethylbenzenes)(3a—c) and 4-substituted-o-xylenes (3d—f) with nitric acid–acetic anhydride gives 4-nitrocyclohexa-2,5-dienones (5a) and (5b) in addition to normal substitution products.
D. J. Blackstock, M. P. Hartshorn, A. J. Lewis, K. E. Richards, J. Vaughan and G. J. Wright, J. Chem. Soc. B, 1971, 1212 DOI: 10.1039/J29710001212
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