Hydrochloric Acid → 1-(3-Bromo-4-methylphenyl)ethan-1-ol

反応式

[H-].[Al+3].[Li+].[H-].[H-].[H-].[CH3:7][C:8]1[CH:13]=[CH:12][C:11]([C:14]([CH3:16])=[O:15])=[CH:10][C:9]=1[Br:17].Cl>CCOCC>[Br:17][C:9]1[CH:10]=[C:11]([CH:14]([OH:15])[CH3:16])[CH:12]=[CH:13][C:8]=1[CH3:7]

参加物

実験手順

Lithium aluminum hydride (6.45 g, 170 mmol) was added to a 250 mL round-bottom flask equipped with a magnetic stirrer bar and a septum. The flask was dried under vacuum and then filled with nitrogen. Anhydrous ether (50 mL) was first injected into the flask. Subsequently, a solution of 3-bromo-4-methylacetophenone (38 g, 180 mmol) in anhydrous ether (50 mL) was injected into the flask dropwise. The reaction mixture was stirred until no more gas was generated. The mixture was poured into a dilute HCl aqueous solution (240 mL), extracted with ethyl acetate (4×30 mL), washed over a saturated NH4Cl aqueous solution (50 mL), dried over anhydrous magnesium sulfate, and concentrated under vacuum to give a crude product. The crude product was further purified by distillation under reduced pressure (130° C., 4 mm Hg) to give 31.35 g (81% yield) of the desired product. 1H NMR (300 MHz, CDCl3) δ 1.47 (3H, t, J=6.4 Hz), 1.76 (1H, s), 2.38 (3H, s), 4.84 (1H, q, J=6.4 Hz), 7.20 (2H, s), 7.55 (1H, s); 3C NMR (75 MHz, CDCl3) δ 22.54, 25.16, 69.33, 124.30, 124.93, 129.34, 130.82, 136.88, 145.27; IR (neat) 3024 (s), 2997 (s), 2927 (m), 1605 (w), 1562 (w), 1494 (m), 1452 (m), 1381 (m), 1331 (w), 1255 (m), 1091 (m), 1038 (m), 1009 (m), 908 (m), 822 (m), 733 (s) cm−1; MS m/z 214 (M+), 199, 197, 171, 169, 119, 91; HRMS calcd for C9H11OBr 213.9993, found 213.9995.