Synthesis of 2,4-Dinitrochlorobenzene

To a reflux apparatus add 110 mL of cold sulfuric acid and 27 g of potassium nitrate or sodium nitrate with stirring, then in small portions add 25 g of o- or p-chloronitrobenzene. Reflux at 140-150°C for 1.5 h, cool down and pour to 1 L of ice water with 50 g of sodium carbonate. Filter, wash with 100 mL of water and recrystallize in ethanol.

Source

The acid salt solution

Starting the reflux

Nitrogen dioxide evolution

The filtered solution

The filtered product

The recrystallized product

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