反应详情

A solution of 1.05 g (7.28 mmol) of crude 3,3-dimethyl-5-oxopentanoic acid (from Example 8a) and 1 g (8.4 mmol) of thionyl chloride in 10 mL of benzene was heated under reflux for 62/3 hours. The reaction mixture was concentrated to give 3,4-dihydro-4,4-dimethyl-2H-pyran-2-one. The nmr spectrum was consistent with the proposed structure.

1. temperatureunder reflux for 62/3 hours
2. concentrationThe reaction mixture was concentrated