Hydrochloric Acid → 3-Isopropyl-2-cyclopenten-1-one
Reaktionsgleichung
[CH:1]([Mg]Cl)([CH3:3])[CH3:2].C(O[C:9]1[CH2:13][CH2:12][C:11](=[O:14])[CH:10]=1)C.Cl>>[CH:1]([C:9]1[CH2:13][CH2:12][C:11](=[O:14])[CH:10]=1)([CH3:3])[CH3:2]Komponenten
4
Reaktionsbedingungen
- Temperatur
- 0 °C
Versuchsvorschrift
Isopropylmagnesium chloride (5 mL, 10 mmol, 2 M in diethyl ether) was placed in a dry flask and cooled to 0° C. 3-Ethoxycyclopentenone (0.88 g, 7 mmol) was added dropwise to the solution of the Grignard reagent, and the resulting mixture was stirred at room temperature for 23 h. At this point, 1 M HCl (15 mL) was added gradually, the aqueous phase was separated and extracted 3×with diethyl ether. The combined organic phases were dried over MgSO4, filtered, and concentrated in vacuo. The product was purified first by Kugelrohr distillation (0.1 torr, 120° C.), then by flash chromatography (1:1 pentane:ether) to afford the product as a colorless liquid (0.171 g, 20%). Spectroscopic data were consistent with previously reported data for this compound.7