反应详情

温度

-60 °C

A solution of p-bromophenetole (2.01 g, 0.01 mol) in tetrahydrofuran is cooled to −65° C., treated dropwise with a 2.5 M solution of n-butyllithium in hexane (4 mL), stirred for 20 minutes at −55 to −65° C., treated dropwise with a solution of isobutyraldehyde (0.91 mL, 0.01 mol) in tetrahydrofuran, stirred overnight at room temperature, diluted with an ice-water mixture, acidified with 10% hydrochloric acid, and extracted with methylene chloride. The combined organic extracts are washed sequentially with water, saturated sodium hydrogen carbonate solution and water, dried over anhydrous sodium sulfate, and concentrated in vacuo to give the title product as a tan oil (1.95 g) which is identified by NMR spectral analyses.

1. stirringstirred overnight at room temperature
2. extractionextracted with methylene chloride
3. washThe combined organic extracts are washed sequentially with water, saturated sodium hydrogen carbonate solution and water
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated in vacuo