反应详情

1-(2-Furyl)-2-methyl-3-buten-1-ol (122 g, 0.8 mole) was dissolved in a 2:1 mixture (1.2 liter) of acetone and water in a reactor, and polyphosphoric acid (20 g) was then added. Thereafter, reaction was carried out at 50° to 60° C. for about 48 hours with stirring. After completion of the reaction, the reaction solution was cooled and neutralized with addition of a saturated aqueous solution (200 ml) of sodium hydrogen carbonate, followed by extraction with a solvent. The extract was washed with water, dried and concentrated. The residue obtained was distilled under reduced pressure to obtain 74 g (yield, 61%) of pure (±)-3-hydroxy-2-(1-methyl-2-propenyl)-4-cyclopenten-1-one having a boiling point of 122°-130° C./3 mmHg.

1. customThereafter, reaction
2. customAfter completion of the reaction
3. temperaturethe reaction solution was cooled
4. extractionfollowed by extraction with a solvent
5. washThe extract was washed with water
6. customdried
7. concentrationconcentrated
8. customThe residue obtained
9. distillationwas distilled under reduced pressure