Studies on the Dibenzo-p-dioxin (Diphenylene Dioxide) Derivatives. XL. Electron Spin Resonance Spectra of Dibenzo-p-dioxin-2, 7-dicarboxylic Acid and 2, 7-Disulfonic Acid.

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Dibenzo-p-dioxin-2, 7-dicarboxylic acid (III) in concentrated sulfuric acid with potassium nitrate gave an electron spin resonance spectrum which was considerably similar to that of dibenzo-p-dioxin-2, 7-disulfonic acid (II). Therefore, the spectra indicated that the distributions of the spin densities of the odd electron were quite similar in both cases.