2-Iodo-4-nitroaniline → 1-Fluoro-2-iodo-4-nitrobenzene

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A solution of nitrosonium tetrafluoroborate (24 g, 0.21 mol) in dichloromethane (200 mL) at 0° C. was treated with a solution of 2-iodo-4-nitroaniline (50 g, 0.19 mol) in dichloromethane (350 mL) and stirred at 0° C. for 1 h. The dichloromethane was concentrated to about half volume and the reaction mixture was treated with 1,2-dichlorobenzene (300 mL). The remaining dichloromethane was further concentrated in vacuo. The resultant 1,2-dichlorobenzene suspension was heated at 110° C. for 1 h, cooled to 20° C., and treated with water (200 mL) and dichloromethane (500 mL). The reaction mixture was filtered over celite and the celite was washed with dichloromethane and water. The aqueous layer of the filtrate was separated and extracted with dichloromethane (2×). The combined organic layers were washed with 20% sodium thiosulfate and brine, dried over anhydrous sodium sulfate, and filtered. The dichloromethane was removed under standard conditions while the 1,2-dichlorobenzene was removed via vacuum distillation to give a crude dark oil. This material was purified by distillation to give the desired product (19 g, 38%) as a solid.

Herkunft & Nachweise