反应详情

In a 200 ml three-necked flask equipped with a mechanical stirrer, dropping funnel, reflux condenser, and a nitogen-inlet tube, 15 gm (147 mmol) of 3-methyl-3-hydroxy-2-butanone, 500 mg (2.0 mmol) of pyridinium p-toluenesulfonate and 100 ml of anhydrous methylenechloride were mixed with stirring under nitrogen stream, and 11.7 gm (162 mmol) of ethylvinylether was added dropwise at room temperature for 3 hours while stirring. After the reaction, the reaction mixture was washed with 5% aqueous sodium hydrogencarbonate, and then the mixture was extracted with chloroform. The extract was dried over anhydrous sodium sulfate and the solvent was removed by evaporation to give a crude product. Distillation of the crude product afforded 17.09 gm of 3-(1-ethoxyethoxy)-3-methyl-butane-2-one (b.p. 38-40/1 mmHg, yield: 66%).

1. customIn a 200 ml three-necked flask equipped with a mechanical stirrer
2. temperaturereflux condenser, and a nitogen-inlet tube
3. additionwas added dropwise at room temperature for 3 hours
4. customAfter the reaction
5. washthe reaction mixture was washed with 5% aqueous sodium hydrogencarbonate
6. extractionthe mixture was extracted with chloroform
7. dry with materialThe extract was dried over anhydrous sodium sulfate
8. customthe solvent was removed by evaporation
9. customto give a crude product
10. distillationDistillation of the crude product