Diethyl Ether → 4-Methoxyphenylacetaldehyde

Temperature

-78 °C

To a stirred solution of methyl 4-methoxyphenylacetate (45.0 g) in toluene (250 ml) cooled to -78° C., add a 1.5M solution of DIBALH in toluene (167 ml) over 5 h, maintaining the reaction temperature at -78° C. Stir for an additional 0.5 h, then pour into 1:1 ice/1M HCl (1500 ml) and Et2O (500 ml). Stir the slurry for 1 h, separate the layers and extract the aq. layer with Et2O (2×500 ml). Wash the combined organic layers with sat'd NaHCO3 (500 ml) and sat'd NaCl, dry (MgSO4), filter and evaporate to give an oil. Perform bulb-to-bulb distillation (100°-130° C., 1 mmHg) to obtain the title compound (33.9 g, 90%) as a colorless liquid. 1H Nmr (CDCl3) δ9.71 (1H, t, J=2.4 Hz), 7.12 (2H, m), 6.89 (2H, m), 3.79 (3H, s) 3.61 (2H, m).

1. stirringStir the slurry for 1 h
2. customseparate the layers
3. extractionextract the aq. layer with Et2O (2×500 ml)
4. washWash the combined organic layers with sat'd NaHCO3 (500 ml)
5. dry with materialdry (MgSO4)
6. filtrationfilter
7. customevaporate
8. customto give an oil
9. distillationbulb-to-bulb distillation (100°-130° C., 1 mmHg)

ORD record

ord-94ca3a40a8c24ab5a11490f320df4c0b

Source dataset

uspto-grants-1995_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05476847