反应详情

A solution of 2-iodo-4-nitrotoluene (50 g, 0.19 mol) in a mixture of glacial acetic acid (380 ml), acetic anhydride (190 ml) and concentrated sulfuric acid (112 ml) was cooled in an ice bath. Chromium trioxide (97 g, 0.57 mol) was added portionwise over 30 minutes, during which time the internal temperature rose to ca. 90° C. The resultant thick suspension was cooled in an ice bath for 30 min, then poured over ice (2 kg). When the ice had melted, the precipitate was collected by filtration, washed with methanol (800 ml) and ether (200 ml), and dried in vacuo to afford 2-iodosyl-4-nitro-benzoic acid I-1a (54.9 a, 94%).

1. temperaturewas cooled in an ice bath
2. customrose to ca. 90° C
3. temperatureThe resultant thick suspension was cooled in an ice bath for 30 min
4. filtrationthe precipitate was collected by filtration
5. washwashed with methanol (800 ml) and ether (200 ml)
6. customdried in vacuo