[N+]([O-])(O)=O.[Cl:5]/[C:6](/[C:13]1[CH:18]=[CH:17][C:16]([Cl:19])=[CH:15][C:14]=1[Cl:20])=[CH:7]\[N:8]1[CH:12]=[CH:11][N:10]=[CH:9]1.O(C(C)C)C(C)C.[OH-].[NH4+]>O>[Cl:5]/[C:6](/[C:13]1[CH:18]=[CH:17][C:16]([Cl:19])=[CH:15][C:14]=1[Cl:20])=[CH:7]\[N:8]1[CH:12]=[CH:11][N:10]=[CH:9]1To a stirred mixture of 20.2 parts of (Z)-1-[2-chloro-2-(2,4-dichlorophenyl)ethenyl]-1H-imidazole mononitrate, 100 parts of water and 70 parts of 2,2'-oxybispropane were added 5 parts of ammonium hydroxide. The whole was stirred for 15 minutes. The layers were separated. The aqueous phase was extracted with 35 parts of 2,2'-oxybispropane. The combined organic layers were washed with water, dried, filtered and evaporated, yielding 15.9 parts of (Z)-1-[2-chloro-2-(2,4-dichlorophenyl)ethenyl]-1H-imidazole; mp. 59.1° C. (compound 2).
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