反应详情

102.1 Grams(1 mole) of methyl pyruvate is dissolved in 204.2 g(2 moles) of acetic anhydride and 5.0 g(20 millimoles) of pyridinium p-toluenesulfonate is added thereto, followed by conducting a reaction at 100 to 110° C. for 7 hours with stirring and refluxing with stirring for 11 hours. After cooling, the reaction solution is poured into 5000 ml of water and the precipitated oily substance is extracted with ethyl ether. The extract layer is washed with water, dried over anhydrous magnesium sulfate, concentrated and distilled under reduced pressure to give 50.0 g of methyl 2-acetyloxyacrylate as colorless oil having bp. 65 to 68° C./11 mmHg.

1. customa reaction at 100 to 110° C. for 7 hours
2. temperaturerefluxing
3. stirringwith stirring for 11 hours
4. temperatureAfter cooling
5. extractionthe precipitated oily substance is extracted with ethyl ether
6. washThe extract layer is washed with water
7. dry with materialdried over anhydrous magnesium sulfate
8. concentrationconcentrated
9. distillationdistilled under reduced pressure