反应详情

2,6-Dichloro-4-aminophenol (0.37 g.) was dissolved in acetone (30 ml.) to which pyridine (0.32 ml.) was added. While mixing, an acetone solution (10 ml.) of the acid chloride prepared from acetylsalicylic acid (0.38 g.) was added by drops. After the reaction was completed, the solution was evaporated under reduced pressure and the residue was dissolved in ethyl acetate and then was washed with water then with 1N-hydrochloric acid. After evaporating off the ethyl acetate under reduced pressure the resulting residue was dissolved in a mixture of methanol and 2N-sodium hydroxide (10 ml. each). The solution was agitated for several hours then acidified with 2N-hydrochloric acid to precipitate the product. By recrystallization in acetone-water, white needle-like crystals of 3',5'-dichloro-2,4'-dihydroxybenzanilide (0.62 g.) were obtained. The yield was 78% and the melting point was 217°-219° C.

1. additionwas added
2. additionWhile mixing
3. additionwas added by drops
4. customthe solution was evaporated under reduced pressure
5. dissolutionthe residue was dissolved in ethyl acetate
6. washwas washed with water
7. customAfter evaporating off the ethyl acetate under reduced pressure the resulting residue
8. dissolutionwas dissolved in a mixture of methanol and 2N-sodium hydroxide (10 ml
9. customto precipitate the product
10. customBy recrystallization in acetone-water