Acetic Acid → 4-Chloro-2-nitrophenylsulfonyl chloride

Temperature

-5 °C

The mixture of 4-Chloro-2-nitro-phenylamine (2.0 g, 11.6 mmol) (Aldrich) in TFA (30 mL) and conc. hydrochloric acid (3 mL) was cooled to −5° C., then a solution of NaNO2 in water (5 mL) was dropped into at such a rate that the temperature did not above 5° C. When the addition was complete, the mixture was stirred at 0° C. for additional 5 min, then poured into a mixture of acetic acid (40 mL), sulfurous acid (40 mL), CuCl2 (824 mg, 6.1 mmol) and CuCl (50 mg, 0.5 mmol), which was cooled to 0° C. in advance. The whole was stirred at room temperature for 40 min, diluted with water (100 mL), filtered. The filter cake was washed with water, dried in vacuo to give 1.5 g 4-Chloro-2-nitro-benzenesulfonyl chloride. MS: [M+H]+=256

1. customdid not above 5° C
2. additionWhen the addition
3. temperaturewas cooled to 0° C. in advance
4. stirringThe whole was stirred at room temperature for 40 min
5. filtrationfiltered
6. washThe filter cake was washed with water
7. customdried in vacuo

ORD record

ord-b21e6ff0c4ad45bda68196433b36229c

Source dataset

uspto-grants-2011_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08058269B2