反应详情

温度

12.5 °C

Hydroquinone (10 g, 0.09 mol) and 1,2-dichloroethane (30 mL) was taken in a round bottom flask, after cooling the flask to about 10-15° C., sulfuric acid (36 N, 8.9 g) was added dropwise at the same temperature and stirring continued further for about 10-15 min. Temperature was slowly raised to 40° C. then stirred for 3-8 h. The reaction mass was then cooled to 25-35° C. and ethyl acetate (100 mL) added to dissolve the solid formed. A solution of potassium 2-ethylhexanoate (18.2 g, 0.099 mol) in ethyl acetate (100 mL) was added slowly. The reaction was further stirred for an hour. The precipitated crude solid was filtered, washed with ethyl acetate to give 18 g of 2,5-dihydroxybenzenesulfonic acid potassium salt.

1. temperatureTemperature was slowly raised to 40° C.
2. stirringthen stirred for 3-8 h
3. temperatureThe reaction mass was then cooled to 25-35° C.
4. dissolutionto dissolve the solid
5. customformed
6. stirringThe reaction was further stirred for an hour
7. customThe precipitated crude solid
8. filtrationwas filtered
9. washwashed with ethyl acetate