Cl[C:2]1[CH:10]=[CH:9][C:5]([C:6]([OH:8])=[O:7])=[CH:4][C:3]=1[N+:11]([O-])=O.O.O.O.O.O.O.O.O.O.[S-2:23].[Na+].[Na+].C(O[C:30](=O)[CH3:31])(=O)C>C(OCC)(=O)C.O.C(O)(=O)C>[CH3:31][C:30]1[S:23][C:2]2[CH:10]=[CH:9][C:5]([C:6]([OH:8])=[O:7])=[CH:4][C:3]=2[N:11]=14-Chloro-3-nitrobenzoic acid (2.02 g, 10.00 mmol), sodium sulfide nonahydrate (7.22 g, 30.00 mmol) and water (5 ml) were suspended, and the mixture was heated at about 100° C. for 30 minutes. After being allowed to cool, the mixture was cooled by ice, and acetic anhydride (18 ml) and acetic acid (10 ml) were added to the mixture. The resulting mixture was heated under reflux for 2 hours and stirred at a room temperature for 15 hours. To the mixture, tap water and then ethyl acetate were added, and sulfur was removed by filtration. The ethyl acetate layer was washed with a saturated saline solution, and then dried over anhydrous magnesium sulfate and concentrated to give the title compound (1.54 g, 80%) as a light-yellow powder.
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