[N+:1]([NH:4][C:5]1[CH:6]=[CH:7][CH:8]=[CH:9][CH:10]=1)([O-])=O.[N:11]([O-:13])=[O:12].[Na+].[Cl:15][CH:16](C(=O)C)[C:17](=[O:19])[CH3:18]>>[Cl:15][C:16](=[N:1][NH:4][C:5]1[CH:6]=[CH:7][CH:8]=[C:9]([N+:11]([O-:13])=[O:12])[CH:10]=1)[C:17](=[O:19])[CH3:18]3-nitroaminobenzene is reacted with sodium nitrite and 3-chloro-2,4-pentanedione as in Example 1 to yield 1-chloro-1-[(3-nitrophenyl)hydrazono]-2-propanone.
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