反应详情

To the suspension of sodium hydride (1.390 g, 95%, 55 mmol) in tetrahydrofuran (150 ml), But-3-en-1-ol (3.966 g, 4.7 ml, 55 mmol) was added. After the reaction mixture was refluxed for 30 min, 4-Bromomethyl-benzoic acid (5.376 g, 25 mmol) was added and the reaction was kept to reflux for additional 10 h. After cooling down, water (100 ml) was added and the tetrahydrofuran was removed under vacuum. This resulting aqueous solution was adjusted with 6N HCl to pH 2 at 5° C. to generate white precipitate, which was then collected by filtration. The recrystallization of this crude product from hexane/ether yielded pure 4-But-3-enyloxymethyl-benzoic acid as colorless crystal (4.15 g, 80.5%). 1H-NMR (400 MHz, d6-DMSO): 7.91 (d, J=8.2, 2 arom. H); 7.41 (J=8, 2 arom. H); 5.81 (m, —CH═CH2); 5.10 (2 d-like, —CH═CH2); 4.53 (s, —OCH2—C6H4); 3.49 (m, CH2═CH—CH2CH2O); 2.32 (m, CH2═CH—CH2CH2O). 13C-NMR (100 MHz, d6-DMSO): 167.14 (—C═O); 143.72; 135.49; 129.73; 129.28 (2 arom. C); 127.08 (2 arom. C); 116.46; 71.13; 69.18.

1. additionwas added
2. temperatureAfter the reaction mixture was refluxed for 30 min
3. temperatureto reflux for additional 10 h
4. temperatureAfter cooling down
5. customthe tetrahydrofuran was removed under vacuum
6. customwas adjusted with 6N HCl to pH 2 at 5° C.
7. filtrationwas then collected by filtration
8. customThe recrystallization of this crude product from hexane/ether yielded pure 4-But-3-enyloxymethyl-benzoic acid as colorless crystal (4.15 g, 80.5%)