Sodium Iodide → 1,3-Dibromo-2-iodo-5-nitrobenzene

Temperature

100 °C

Dimethylformamide (4 L) and trifluoromethane sulfonic acid 2,6-dibromo-4-nitrophenyl ester (1135 g, 2.65 moles) were charged into a 22 L jacketed vessel equipped with a mechanical stirrer, a condenser, and a nitrogen purge. Sodium iodide (1595 g, 10.64 moles) was added to the reaction mixture in portions while maintaining the reaction temperature below 25° C. The reaction mixture was then heated to 100° C. and monitored for completion by HPLC. Upon completion, the reaction mixture was cooled to 0° C. Water (4 L) was added while maintaining the temperature below 14° C. The reaction mixture was stirred for 30 min, then filtered and washed with water (1.5 L). The resultant solid product was dried overnight by evaporation under air flow at room temperature to yield 1,3-dibromo-2-iodo-5-nitrobenzene (892.7 g, 82.9%). The product may optionally be purified further by recrystallization from ethanol.

1. customequipped with a mechanical stirrer, a condenser
2. customa nitrogen purge
3. temperaturewhile maintaining the reaction temperature below 25° C
4. temperatureUpon completion, the reaction mixture was cooled to 0° C
5. temperaturewhile maintaining the temperature below 14° C
6. filtrationfiltered
7. washwashed with water (1.5 L)
8. customThe resultant solid product was dried overnight by evaporation under air flow at room temperature

ORD record

ord-3845e243f5ae454fa2144cae933d8fb5

Source dataset

uspto-grants-2004_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06806381B2