反应详情

To a solution of 4-cyanobenzaldehyde (20.0 g, 152.5 mmol) and ethylene glycol (25.5 mL, 457.5 mmol) in toluene (250 mL) was added p-toluenesulfonic acid (300 mg). The flask was equipped with a Dean-Stark trap and the mixture heated to reflux. After 5 hr the mixture was concentrated. The residue was taken up in ethyl acetate and washed with saturated NaHCO3, water (2×), and brine. The organic layer was dried (MgSO4), filtered, and concentrated to give 4-(1,3-dioxolan-2-yl)benzonitrile as a clear oil which solidified under vacuum: 1H-NMR (500 MHz, CDCl3): δ 7.67 (2H, d, J=8.06 Hz), 7.59 (2H, d, J=8.30 Hz), 5.85 (1H, s), 4.13-4.05 (4H, m).

1. customThe flask was equipped with a Dean-Stark trap
2. temperaturethe mixture heated to reflux
3. concentrationAfter 5 hr the mixture was concentrated
4. washwashed with saturated NaHCO3, water (2×), and brine
5. dry with materialThe organic layer was dried (MgSO4)
6. filtrationfiltered
7. concentrationconcentrated