反应详情

50 g (0.45 mol) of 1,2-dicyclohexandione were dissolved in a mixture of 1 L of toluene and 0.5 L of ethanol. 10 g of p-toluenesulfonic acid were added and the solution heated at reflux for 2 days. (TLC chloroform/methanol 6/1). The solvent was then evaporated, the residue redissolved with dichloromethane and washed with a saturated solution of NaHCO3. The organic layer was dried over Na2SO4 and concentrated. The crude was purified by chromatography on a silica gel column by eluting with a mixture of cyclohexane/ethyl acetate 98/2 (66% yield as an oil).

1. temperaturethe solution heated
2. temperatureat reflux for 2 days
3. customThe solvent was then evaporated
4. dissolutionthe residue redissolved with dichloromethane
5. washwashed with a saturated solution of NaHCO3
6. dry with materialThe organic layer was dried over Na2SO4
7. concentrationconcentrated
8. customThe crude was purified by chromatography on a silica gel column
9. washby eluting with a mixture of cyclohexane/ethyl acetate 98/2 (66% yield as an oil)