[Cl:1]C1C=C(NC(NC)=O)C=CC=1Cl.O=CC(Cl)(Cl)Cl.[Cl:20][C:21]1[CH:22]=[C:23]([NH:28][C:29]([N:31]([CH:33](O)[C:34]([Cl:37])([Cl:36])[Cl:35])[CH3:32])=[O:30])[CH:24]=[CH:25][C:26]=1[Cl:27].S(Cl)(Cl)=O>S(=O)(=O)(O)O.C(OCC)C>[CH3:32][N:31]([CH:33]([Cl:1])[C:34]([Cl:37])([Cl:36])[Cl:35])[C:29]([NH:28][C:23]1[CH:24]=[CH:25][C:26]([Cl:27])=[C:21]([Cl:20])[CH:22]=1)=[O:30]1-(3,4-dichlorophenyl)-3-methyl urea (15.2 g, 0.07 mol) was combined with 15.0 g (0.1 mol) of chloral and 5 drops of concentrated sulfuric acid. The mixture was heated for an hour to effect reaction, then stripped under vacuum. To the crude 1-(3,4-dichlorophenyl)-3-(1-hydroxy-2,2,2-trichloroethyl)-3-methyl urea was added an excess of thionyl chloride and the mixture was heated gradually to a maximum of 65° C. Diethyl ether was added to the crude product, and the insoluble product was collected on a filter, washed twice with diethyl ether and dried. The 15.3 g of product, which melted at 132°-140° C., analyzed as follows: %Cl, calculated 55.2, found 46.0.
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