反应详情

5-Cyclopentylidene-2-pentanone (13.4 g; 88 mmol) in ether (13 ml) was added dropwise during 30 minutes to a 3M solution of methylmagnesium bromide in ether (38 ml; 114 mmol). After addition of more ether (25 ml), the mixture was heated under reflux for 2 hours, then cooled down to room temperature, poured into ice (40 g), acidified with 5N HCl (50 ml) and extracted with MTBE (130 ml). The aqueous phase was separated and extracted with MTBE (2×130 ml). The combined organic phases were washed with saturated NaHCO3 (2×130 ml), water (130 ml), dried over MgSO4 and concentrated in vacuo. Distillation (52° C.-55° C./0.06 torr) yielded 11.24 g (76% yield) of 5-cyclopentylidene-2-methylpentan-2-ol.

1. temperaturethe mixture was heated
2. temperatureunder reflux for 2 hours
3. extractionextracted with MTBE (130 ml)
4. customThe aqueous phase was separated
5. extractionextracted with MTBE (2×130 ml)
6. washThe combined organic phases were washed with saturated NaHCO3 (2×130 ml), water (130 ml)
7. dry with materialdried over MgSO4
8. concentrationconcentrated in vacuo
9. distillationDistillation (52° C.-55° C./0.06 torr)