反应详情

Into the same flask as used in Example 1, 2-allyl-3-hydroxy-3-methyl-4-cyclopentenone (152 g), p-toluenesulfonic acid (1 g) and acetic anhydride (320 g) were charged, and stirring was continued for 2 hours at 100° C. After completion of the reaction, acetic anhydride was removed under reduced pressure, and the residue was extracted with toluene. The toluene layer was washed with 1% aqueous sodium carbonate solution and water in order and concentrated to give dl-3-acetoxy-2-allyl-3-methyl-4-cyclopentenone (186 g). Yield, 96%. B.P., 72°-75° C./0.2-0.3 mmHg.

1. additionwere charged
2. customwas removed under reduced pressure
3. extractionthe residue was extracted with toluene
4. washThe toluene layer was washed with 1% aqueous sodium carbonate solution and water in order
5. concentrationconcentrated