C(O)C.[H][H].[CH3:6][C:7]1[C:15]2[C:10](=[C:11]([CH2:19][CH3:20])[C:12]([N+:16]([O-])=O)=[CH:13][CH:14]=2)[NH:9][CH:8]=1>[Fe].C(O)(=O)C>[CH3:6][C:7]1[C:15]2[C:10](=[C:11]([CH2:19][CH3:20])[C:12]([NH2:16])=[CH:13][CH:14]=2)[NH:9][CH:8]=1A mixture of 0.5 1 of 96° ethanol, 0.5 l of glacial acetic acid and 100 g of hydrogen-reduced pure iron is heated to 90° C. 51 g of 3-methyl-6-nitro-7-ethylindole are added in portions over 15 minutes.
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