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W.I. Stephen 《Analytica chimica acta》1973,64(1):163-164
The titration of some substituted azoles in non-aqueous solution has been studied and their relative basic strengths determined. Differentiating titration of mixtures of substituted imidazoles is only possible when one of the imidazoles is substituted with a powerful electronegative substituent, e.g. a nitro group. Azolium halides may be titrated with perchloric acid in anhydrous acetic acid after addition of mercury(II) acetate, or dissolved in acetic anhydride without addition of mercury(II) acetate; dissolved in methanol, they may be titrated as acids with tetrabutylammonium hydroxide in benzene/methanol. The acidic and basic properties of some substituted pyrazol-5-ones have been compared. 相似文献
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