反应详情

2.5 g (13 mMole) of 2,6,6-trimethyl-1-(but-2-enoyl)-cyclohexa-1,3-dien [prepared according to the method given in Helv. Chim. Acta 54, 1899 (1971)] dissolved in 50 ml of dioxane were heated, under nitrogen atmosphere, during 45 min. at 60°, in the presence of 1.8 g (16 mMole) of selenium oxide. The reaction mixture was then cooled, concentrated under reduced pressure, and the obtained residue, diluted with 50 ml of acetic acid, was finally stirred at room temperature for 2 hours in the presence of 6 g of Raney nickel. The reaction mixture was then filtered, evaporated to dryness and the obtained residue was distilled (b.p. 100°-110°/o.2 Torr) to afford 2.4 g of a material containing 80 % of the desired keto compound.

1. temperatureThe reaction mixture was then cooled
2. concentrationconcentrated under reduced pressure
3. additionthe obtained residue, diluted with 50 ml of acetic acid
4. filtrationThe reaction mixture was then filtered
5. customevaporated to dryness
6. distillationthe obtained residue was distilled (b.p. 100°-110°/o.2 Torr)