反应详情

A portion of 4-bromophenol is converted to 4-bromo-2-nitrophenol by the method described in Rec. Trav. Chim. 29, 187(1910). A 28 g. portion of 4-bromo-2-nitrophenol is dissolved in 280 ml. of acetone. A 280 ml. portion of water and 112 g. of Na2S2O4 are added with stirring. The mixture is refluxed for 2 hours, cooled to room temperature and extracted six times with ether. The ether extracts are washed twice with brine, dried over magnesium sulfate and recrystallized from a mixture of charcoal and 400 ml. of water giving an oil. This oil is redissolved in 600 ml. of water, cooled to 0° C. and filtered giving 5-bromo-2-hydroxyaniline as tan crystals.

1. temperatureThe mixture is refluxed for 2 hours
2. extractionextracted six times with ether
3. washThe ether extracts are washed twice with brine
4. dry with materialdried over magnesium sulfate
5. customrecrystallized from a mixture of charcoal and 400 ml
6. dissolutionThis oil is redissolved in 600 ml
7. temperatureof water, cooled to 0° C.
8. filtrationfiltered