[N+:1]([C:4]1[C:9]([CH3:10])=[CH:8][C:7]([C:11]([CH3:14])([CH3:13])[CH3:12])=[CH:6][C:5]=1[CH3:15])([O-])=O.[Cl-].[Cl-].[Ca+2]>C(O)C.O.[Zn]>[CH3:15][C:5]1[CH:6]=[C:7]([C:11]([CH3:13])([CH3:12])[CH3:14])[CH:8]=[C:9]([CH3:10])[C:4]=1[NH2:1]Water, 20 mL, was added to a mixture of 12.0 g (58.0 mmol) of 1-nitro-4-tert-butyl-2,6-dimethylbenzene dissolved in 160 mL of ethanol. To the stirring solution of 1-nitro-4-tert-butyl-2,6-dimethylbenzene was added CaCl2, 4.8 g (43.2 mmol), dissolved in 20 mL of water, followed by the addition of zinc powder, 50.0 g (76.5 mmol). The reaction was stirred overnight at 65° C., then cooled to ambient temperature and filtered. The filtrate was extracted three times with ether, and the organic layer was dried over MgSO4. Removal of the solvent gave 9.58 g (93%) of a brown oil. 1H NMR (300 MHz, CDCl3): δ=6.90, s, 2H, 3.40, broad singlet, 2H, 2.11, s, 6H, 1.21, s, 9H.
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