反应详情

温度

0 °C

Ethyl 3-bromo-4-methylbenzoate was reduced follows: 2 equivalents lithium aluminium hydride (LAH) in THF was cooled to 0° C. Ethyl 3-bromo-4-methylbenzoate in anhydrous THF (10 mL) was added slowly to the cooled solution of LAH over 10 minutes, while stirring. The mixture was stirred at room temperature for 1 hour. The reaction was cooled to 0° C. and poured into ether (100 mL). The mixture was acidified by adding 1N HCl (aqueous) dropwise over 10 minutes. Separate fractions and wash aqueous phase with ether (50 mL). The fractions were combined and dried over magnesium sulfate. Solvent removal left a clear oil. The yield was 90%. 1H NMR (Varian 300 MHz, CDCl3, shifts relative to the solvent peak at 7.24 ppm) δ 7.5 (s, 1H) 7.2 (d, 1H) 7.1 (d, 1H), 4.6 (s, 2H) 2.3 (s, 3H).

1. stirringThe mixture was stirred at room temperature for 1 hour
2. washSeparate fractions and wash aqueous phase with ether (50 mL)
3. dry with materialdried over magnesium sulfate
4. customSolvent removal
5. waitleft a clear oil