反应详情

Allyl bromide (195 g., 1.62 mol.) was added over a 15 minute period to a stirred ice-cold mixture of cyclohexanedione (165 g., 1.47 mol.), copper-bronze (4.5 g.), and 330 ml. of 20% by weight aqueous potassium hydroxide. After 6 hours, the reaction was mixed with 1500 ml. of a 5% by weight aqueous sodium hydroxide solution and 1000 ml. of ethyl ether, filtered and the separated water layer acidified with 4N aqueous hydrochloric acid to pH 1. A brown solid (188 g.) formed upon refrigeration at 0° C. The solid was taken up in ethyl acetate and the solution was washed with water (3 × 150 ml.), dried (MgSO4), treated with charcoal, and condensed until turbid. Upon cooling, 126 g. (57%) of 2-allyl-1,3-cyclohexanedione was collected, m.p. 125°-127° C.

1. additionthe reaction was mixed with 1500 ml
2. filtrationof ethyl ether, filtered
3. customA brown solid (188 g.) formed upon refrigeration at 0° C
4. washthe solution was washed with water (3 × 150 ml.)
5. dry with materialdried (MgSO4)
6. additiontreated with charcoal, and condensed until turbid
7. temperatureUpon cooling
8. custom(57%) of 2-allyl-1,3-cyclohexanedione was collected