反应详情

温度

80 °C

N-Methylacetanilide (25.0 g, 188.0 mmol) was added to chlorosulfonic acid (62.8 ml) under cooling with ice in portions at such a rate as not to raise the temperature of the resulting mixture to 50° C. or above, which took about 10 minutes. The obtained mixture was stirred at 80° C. for 2.5 hours and poured into a mixture comprising ice (200 ml), hexane (30 ml) and isopropyl ether (30 ml) under cooling with ice at 20° C. or below in portions to decompose excess chlorosulfonic acid. The precipitated crystal was recovered by filtration, washed with water and dissolved in ethyl acetate. The obtained solution was washed with water and a saturated aqueous solution of common salt. The organic layer was dried over magnesium sulfate and concentrated to give the title compound as a white crystal (19.4 g, yield: 42%).

1. temperatureunder cooling with ice in portions at such a rate as not
2. temperatureto raise the temperature of the resulting mixture to 50° C. or above
3. temperatureunder cooling with ice at 20° C. or below in portions
4. filtrationThe precipitated crystal was recovered by filtration
5. washwashed with water
6. dissolutiondissolved in ethyl acetate
7. washThe obtained solution was washed with water
8. dry with materialThe organic layer was dried over magnesium sulfate
9. concentrationconcentrated