3-Amino-2,4,6-triiodobenzoic acid

Amino-2,4,6-triiodobenzoic acid 3,6,9-Trioxaundecane diacid dichloride... 

Amino-2,4,6-triiodobenzoic acid (51.5 g) was mixed with 125 ml of acetic anhydride containing 2 drops of concentrated sulfuric acid and refluxed for thirty minutes. The mixture was allowed to cool slightly, and then was poured into 600 ml of water at room temperature and stirred until crystallization was complete. The mixed anhydride of 3-acetylamino-2,4,6-triiodobenzoic acid with acetic acid thus prepared was then separated by filtration and washed with water. Without drying, the solid was suspended in 600 ml of water and hydrolyzed with a slight excess of ammonium hydroxide. It was necessary to warm the mixture slightly and stir it for about one-half hour in order to dissolve all the solid. The solution was then treated with activated carbon, filtered and precipitated with an excess of hydrochloric acid, filtered, washed and dried at 70°C. The yield was 51.5 g of 3-acetylamino-2,4,6-triiodobenzoic... 

C7H4CIF04S 2-chlorO 5-(fluorosulfonyi)benzoic acid 21346-66-7 25.00 1.5768 2 9826 C7H4I3N02 3-amino-2,4,6-triiodobenzoic acid 3119-15-1 25.00 2.7479 2... 

Amino-2,4,6-triiodobenzoic acid is diazotized and allowed to react with 2,6-diaminopyridine to give 3-(2,6-diamino-3-pyridylazo)-2,4,6-tiiiodobenzoic acid. Diazotization of 6-amino-l,2,3.4-tetrahydrocarbazole followed by treatment with 2,6-diaminopyridine yields IX-198. ... 

---