Hydroquinone: Aniline Oxidised to Quinone and Reduced, Thorpe 1912

Aniline in cold dilute sulfuric acid is oxidised by sodium dichromate to quinone, which sulfur dioxide reduces to hydroquinone; ether extracts it, and it is recrystallised from water with charcoal. Thorpe (1912) gives up to 85 % crude yield. A few ppm of hydroquinone keep vinyl acetate from forming peroxides. The picture: our diagram of the route.

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Aniline: Nitrobenzene Reduced with Iron and Acid, Cain 1919

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