反应详情

In the same flask as in Example 1, 10% aqueous hydrochloric acid (10 ml) and dioxane (10 ml) were charged, and 2-allyl-3-acetoxy-3-methyl-4-cyclopentenone (1.94 g) was dropwise added thereto in 2 hours while keeping the inner temperature at 0° to 10° C. After completion of the dropwise addition, the resultant mixture was stirred at the same temperature as above for 3 hours. The reaction mixture was subjected to post-treatment and purification as in Example 1 to give 1.37 g of 2-allyl-3-methyl-4-hydroxy-2-cyclopentenone. Yield, 90%.

1. customat 0° to 10° C
2. additionAfter completion of the dropwise addition
3. custompurification as in Example 1