反应详情

Chromium trioxide (951 mg, 9.51 mmole; dried in vacuo over phosphorous pentoxide) was added to a stirred solution of 1.49 g (18.88 mmole) of dry pyridine in 25 ml of dry methylene chloride. The deep red solution was stirred for 15 minutes at room temperature. A solution of (trans)-3-(6-phenyl-1,3,5-hexatriynyl)oxiranemethanol (300 mg, 1.35 mmole; see example 3) in 5 ml of dry methylene chloride was then added in one portion. A tarry, black deposit separated immediately. After stirring for 20 minutes at room temperature, the solution was decanted and filtered through a pad of silica gel. Several portions of ether were then passed through the silica gel. Solvent was removed from the combined filtrates and the residue was chromatographed on silica gel (ether-hexane) to afford 130 mg of the title compound.

1. customA tarry, black deposit separated immediately
2. stirringAfter stirring for 20 minutes at room temperature
3. customthe solution was decanted
4. filtrationfiltered through a pad of silica gel
5. customSolvent was removed from the combined filtrates
6. customthe residue was chromatographed on silica gel (ether-hexane)