Ammonia → 2-Isopropyl-4-nitro-benzonitrile

Temperature

0 °C

2-Isopropyl-4-nitro-phenylamine (1.0 g, 5.55 mmol) was dissolved in 5N hydrochloric acid (10 mL) and cooled to 0° C. A solution of sodium nitrite (0.96 g, 13.9 mmol) in water (5 mL) was added and the mixture stirred at this temperature for 1 hr. The mixture was filtered and the solids washed with ice-water, the filtrate then being added to a previously-prepared and cooled (0° C.) solution of CuCN (0.82 g, 9.16 mmol) and NaCN (0.68 g, 13.9 mmol) in water. This mixture was warmed to r.t. and stirred for 1 hr, then ethyl acetate was added and the mixture basified with ammonia solution. Precipitated copper salts were filtered off, and the filtrate was extracted with ethyl acetate. The organic phase was washed with water and brine, dried over sodium sulfate and concentrated. The crude product was purified by column chromatography on silica gel (60-120 mesh), eluting with 4% ethyl acetate/petroleum ether to yield 2-isopropyl-4-nitro-benzonitrile (440 mg, 42%).

1. filtrationThe mixture was filtered
2. washthe solids washed with ice-water
3. additionthe filtrate then being added to
4. customa previously-prepared
5. temperatureThis mixture was warmed to r.t.
6. stirringstirred for 1 hr
7. filtrationPrecipitated copper salts were filtered off
8. extractionthe filtrate was extracted with ethyl acetate
9. washThe organic phase was washed with water and brine
10. dry with materialdried over sodium sulfate
11. concentrationconcentrated
12. customThe crude product was purified by column chromatography on silica gel (60-120 mesh)
13. washeluting with 4% ethyl acetate/petroleum ether

ORD record

ord-fcbc93dd597f405fa909575963f56723

Source dataset

uspto-grants-2013_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08604029B2