[N+:1]([O-:4])([O-])=[O:2].[K+].[CH3:6][CH:7]1[C:15]2[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=2)[C:9](=[O:16])[CH2:8]1.C(OCC)(=O)C>S(=O)(=O)(O)O>[CH3:6][CH:7]1[C:15]2[C:10](=[CH:11][C:12]([N+:1]([O-:4])=[O:2])=[CH:13][CH:14]=2)[C:9](=[O:16])[CH2:8]1As presented in the following reaction formula, a solution of potassium nitrate (KNO2; 6.2 g, 0.06 mol) in sulfuric acid (30 mL) was added dropwise at 0° C. to a mixture of 3-methyl-2,3-dihydro-1H-inden-1-one (9.0 g, 0.06 mol) in sulfuric acid ic (H2SO4; 40 mL). Then, the mixture was stirred at 0° C. until the completion of reaction. The mixture obtained after the reaction was added to ice water and filtered. The cake was washed with water and purified by silica gel (100 g) column chromatography (product of Merck Co., Ltd.) using an eluent of pentane (PE):ethyl acetate (10:1 (by volume)) to give 3-methyl-6-nitro-2,3-dihydro-1-H-inden-1-one (8 g, yield: 69%) as a yellow solid.
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