反应详情

2,2-Dimethyl-4-pentenoic acid (15 g, 0.117 mol) was mixed with 70 mL anhydrous methanol and 50 mL toluene. Concentrated sulfuric acid (0.1 mL ) was added. The solution was refluxed for 24 h. Solvents were then removed. The crude product was distilled under reduced pressure to gave 6 g pure product. 1H NMR (CDCl3): δ 1.28 (s, 6H, —CMe2—); 2.37 (d, 2H, CH2═CHCH2—); 3.77 (s, 3H, —CO2Me); 5.15 (m, 2H, CH2═CH—); 5.84 (m, 1H, CH2═CH—)

1. temperatureThe solution was refluxed for 24 h
2. customSolvents were then removed
3. distillationThe crude product was distilled under reduced pressure