Synthesis of 2-Iodobenzoic Acid

To a beaker add 1.2 mL of conc. sulfuric acid and 14.5 mL of water to this solution 1.96 g of anthranilic acid is added with heating the solution to almost boiling, thereafter the solution is cooled down to 5°C in a freezer. A solution is prepared from 1.07 g of sodium nitrite and 5 mL of water which is slowly dropped to the cold solution of anthranilic acid. Then a solution is made by dissolving 3.6 g of potassium iodide in 18 mL of 1M sulfuric acid, thereafter the solution is slowly poured into the earlier solution. With stirring the solution is boiled for 6 minutes, cooled down in a freezer and filtered. The crude product is recrystallized from hot 1:1 ethanol-water solution then recrystallized twice from hot water. Decolorizing can be used to make the product more pure and white.

2-iodobenzoico acido prep._

The crude product crystallizing out from the mother solution

2-iodobenzoico grezzo_

The crude product

2-iodobenzoico crist._

The recrystallized product

iodobenzoico crist. acqua_

Second recrystallization

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