Abstract
The nitration of 1,4-naphthoquinone derivatives and phthalic anhydride by nitronium tetrafluoroborate in tetramethylene sulphone is reported. The reaction of 2,3-dicyano-1,4-dimethoxynaphthalene with nitronium hexafluorophosphate in acetonitrile gave 2,3-dicyano-1,4-naphthoquinone and N-methylacetamide. On the basis of the above observation the mechanism of oxidative demethylation of methyl naphthyl ethers by nitronium salts is discussed.
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