Potassium Iodide → 2-Chloro-6-iodobenzoic acid
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N[C:2]1[CH:10]=[CH:9][CH:8]=[C:7]([Cl:11])[C:3]=1[C:4]([OH:6])=[O:5].N([O-])=O.[Na+].[I-:16].[K+]>Cl.O.S(=O)(=O)(O)O>[Cl:11][C:7]1[CH:8]=[CH:9][CH:10]=[C:2]([I:16])[C:3]=1[C:4]([OH:6])=[O:5]N[C:2]1[CH:10]=[CH:9][CH:8]=[C:7]([Cl:11])[C:3]=1[C:4]([OH:6])=[O:5].N([O-])=O.[Na+].[I-:16].[K+]>Cl.O.S(=O)(=O)(O)O>[Cl:11][C:7]1[CH:8]=[CH:9][CH:10]=[C:2]([I:16])[C:3]=1[C:4]([OH:6])=[O:5]To the cold solution of 2-amino-6-chlorobenzoic acid (2.0 g, 11.6 mmol) in conc. HCl (10 mL) was added aq. solution of sodium nitrite (0.8 g, 11.6 mmol) at 0° C. followed by addition of solution of potassium iodide (2.88 g, 17.4 mmol) in water and conc. sulphuric acid (1 mL). The reaction mixture was refluxed for 2 h. The reaction mass was washed with sodium metabisulphate solution and extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulphate and concentrated to afford 2.0 g of desired product. 1H NMR (300 MHz, DMSO d6): δ 7.08 (t, J=7.8 Hz, 1H), 7.42 (d, J=8.4 Hz, 1H), 7.76 (d, J=7.8 Hz, 1H), 8.37 (br s, 1H); MS (m/z): 280.59 (M)−.
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