Nitric Acid → 4,5-Dichloro-2-nitrophenol

Temperature

0 °C

To a solution of 3,4-dichlorophenol (30 g, 185 mmol) in DCM (300 mL) at −15° C., sulfuric acid (24 g, 278 mmol) was added. To this mixture, nitric acid (19 g, 194 mmol) was added dropwise (over 20 min) and the temperature was controlled between −15° C. to −5° C. The resulting mixture was stirred at 0° C. for 1 h. The mixture was poured into ice and extracted with ethyl acetate. The combined organic layer was washed with water, saturate NaHCO3 aqueous solution and brine, dried over Na2SO4 and then concentrated in vacuo. The residue was purified by flash column chromatography on silica gel (petroleum ether/ethyl acetate=100:1) to afford the desired product (16 g, 42% yield) as a solid.

1. customwas controlled between −15° C. to −5° C
2. additionThe mixture was poured into ice
3. extractionextracted with ethyl acetate
4. washThe combined organic layer was washed with water
5. concentrationsaturate NaHCO3 aqueous solution and brine
6. dry with materialdried over Na2SO4
7. concentrationconcentrated in vacuo
8. customThe residue was purified by flash column chromatography on silica gel (petroleum ether/ethyl acetate=100:1)

ORD record

ord-dbef46cdf96547dbae3295511829dcde

Source dataset

uspto-grants-2016_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09227978B2