Abstract
Deuterium exchange is observed in methanolic solutions of m -dinitrobenzene in the presence of the methoxide ion. No visible absorption characteristic of the Janovsky reaction is observed in this system. Consequently there appears to be little support for the suggestion (based on similar exchange reactions) that the blue colour obtained with the same system in dimethylformamide or dimethylsulphoxide is necessarily due to the dinitrophenyl anion. Many compounds which have weakly acidic hydrogen atoms appear to be effective in the Janovsky reaction.
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