反应详情

trans-Cyclohexane-1,4-dicarboxylic acid dimethyl ester (34.2 g, 0.171 mol) was dissolved in 400 mL of anhydrous methanol and the solution brought to reflux. Slowly (dropwise), a solution of KOH (11.2 g, 0.171 mol, 85% purity) in dry methanol was added to the refluxing solution. The solution continued to reflux for 5 hours, and was then cooled and concentrated under reduced pressure to give a white solid. Water was added to dissolve most of the solid, and the aqueous mixture was washed with ether (3×) in a separatory funnel. The aqueous layer was brought to pH ˜6, the resulting white precipitate was collected via filtration and washed (1×) with a small amount of water. Air drying afforded trans-cyclohexane-1,4-dicarboxylic acid monomethyl ester as a white solid.

1. temperatureto reflux
2. temperatureto reflux for 5 hours
3. temperaturewas then cooled
4. concentrationconcentrated under reduced pressure
5. customto give a white solid
6. dissolutionto dissolve most of the solid
7. washthe aqueous mixture was washed with ether (3×) in a separatory funnel
8. filtrationthe resulting white precipitate was collected via filtration
9. washwashed (1×) with a small amount of water
10. customAir drying