反应详情

温度

20 °C

5 ml. of water and 1.9 ml. of dimethyl sulfate were added to 1.52 g. of thiourea (20 mmol). The mixture was stirred for about 3 mins. (until the initial heat evolution had subsided). The clear solution was then heated on a steam bath for 1 hour with stirring. The solution was cooled to about 20° C. and surrounded by a water bath (18° -22° C.). Freshly distilled methyl chloroformate (3.1 ml., 40 mmol) was added all at once followed by dropwise addition of 25 ml. of 10% aqueous sodium hydroxide over a period of 30 mins. The resulting product was isolated by extraction with methylene chloride and concentrated in vacuo to give an oily yellow solid which crystallized from ether as white prisms, mp. 97° -100° C.

1. temperature(until the initial heat evolution
2. temperatureThe clear solution was then heated on a steam bath for 1 hour
3. stirringwith stirring
4. customsurrounded by a water bath
5. custom(18° -22° C.)
6. additionall at once followed by dropwise addition of 25 ml
7. concentrationconcentrated in vacuo
8. customto give an oily yellow solid which
9. customcrystallized from ether as white prisms, mp. 97° -100° C.