Phosphorus oxychloride → 2,4-Dichloro-3,5-dinitrobenzonitrile

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Reaction Steps

A mixture of 66.0 gm. (0.235 mole) of 2,4-dichloro-3,5-dinitrobenzamide and 140 ml. of phosphorus oxychloride is heated at reflux for 1 hour. The solution is cooled to room temperature. The excess phosphorus oxychloride is distilled off in vacuo. The solid residue is triturated with ice-water and filtered. There is obtained 54.0 g. (88%) of a tan solid melting at 139°-141°.

Provenance & Evidence