Ammonium Chloride → 4-Chloro-5-iodobenzene-1,2-diamine

Temperatur

50 °C

To a suspension of 5-chloro-4-iodo-2-nitroaniline (36.5 g, 122 mmol) in EtOH (800 mL) and water (150 mL) was added iron powder (38 g, 673 mmol) and NH4Cl (16 g, 306 mmol). The mixture was heated under nitrogen at 50° C. overnight. Additional iron powder (38 g, 673 mmol) and NH4Cl (16 g, 306 mmol) were added and heating was continued for 45 h. The reaction mixture was cooled, filtered and concentrated. The residue was re-dissolved in ethyl acetate and washed with sodium bicarbonate solution. The organic phase was concentrated to afford the desired product as a gray solid, which was used in the next step without further purification.

1. temperatureheating
2. temperatureThe reaction mixture was cooled
3. filtrationfiltered
4. concentrationconcentrated
5. dissolutionThe residue was re-dissolved in ethyl acetate
6. washwashed with sodium bicarbonate solution
7. concentrationThe organic phase was concentrated

ORD-Eintrag

ord-1084f6301b9d46f7b4fb2ec368d6b5a6

Quelldatensatz

uspto-grants-2013_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08394969B2