[C:1](=[O:4])([O-])[O-].[K+].[K+].[Cl:7][C:8]1[CH:13]=[CH:12][C:11](O)=[CH:10][CH:9]=1.ClC1[CH:21]=[CH:20][C:19]([N+:22]([O-:24])=[O:23])=[CH:18][CH:17]=1>CN(C)C=O.[Cu]>[Cl:7][C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][C:9]=1[O:4][C:1]1[CH:21]=[CH:20][C:19]([N+:22]([O-:24])=[O:23])=[CH:18][CH:17]=156 g (0.400 mol) of potassium carbonate and 5.6 g of purified copper are added to a lukewarm solution (≃60° C.) of 51.5 g (0.400 mol) of p-chlorophenol and 72 g (0.456 mol) of p-chloronitrobenzene in 40 ml of dimethylformamide and the mixture is then heated to the reflux temperature for 5 hours. The inorganic salts are removed by filtering the reaction mixture and the dimethylformamide is evaporated under reduced pressure. The residue is purified by crystallisation from methanol to give 83.2 g of a yellow beige powder.
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