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Preparation of phenazine N5,N10-dioxides: Effects of benzofuroxan substituents in the outcome of their expansion reaction with phenolates

The mesomeric effects of the benzofuroxan substituent in the preparation of phenazine N5,N10-dioxides are described. The electronic characteristics of the substituent in 5-substituted benzofuroxans determine the ratio of the 7- and 8-isomers of phenazine N5,N10-dioxides when substituted phenols are used.

phenazine N5,N10-dioxide; benzofuroxan tautomerism; mesomeric effect


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