反应详情

To a vigorously-stirred solution of 31.0 g of cyclopropanecarboxylic acid in 330 ml of ether is added a solution of n-butyllithium (748 mmoles) in ca. 750 ml. of 2:1 ether-hexane during 1 hour at 5-10° C. The resulting suspension is diluted with 300 ml of ether and stirred at room temperature for 2 hours and at reflux for 2 hours. The mixture is cooled and poured into several portions of 1:1 ice - 4N hydrochloric acid. The ethereal phases are combined and washed with brine, sodium carbonate solution, and brine. The extract is dried over magnesium sulfate and concentrated. The residue is distilled to provide a liquid, b.p. 102°-104° C. (80 mm), pmr spectrum (CDCl3):δ2.55 (triplet, --CH2CO--).

1. temperatureat reflux for 2 hours
2. temperatureThe mixture is cooled
3. washwashed with brine, sodium carbonate solution, and brine
4. dry with materialThe extract is dried over magnesium sulfate
5. concentrationconcentrated
6. distillationThe residue is distilled
7. customto provide a liquid, b.p. 102°-104° C. (80 mm), pmr spectrum (CDCl3)