反应详情

Potassium nitrate (16.4 g, 147.4 mmol) was added to concentrated H2SO4 (85 ml, 1582 mmol) at 0° C., followed by slow addition of 2,4-difluorobenzonitrile (11.0 g, 79.1 mmol). The suspension was stirred at this temperature for an additional 4 hrs and quenched ice/water (800 ml). The resulting solid was collected by filtration and dried to give the title compound (13.8 g, 95%) as a white solid. NMR (400 MHz, CDCl3) 8.48 (m, 1H), 7.24 (m, 1H).

1. customquenched ice/water (800 ml)
2. filtrationThe resulting solid was collected by filtration
3. customdried