反应详情

Potassium nitrate (6.56 g, 64.8 mmol) was added to concentrated H2SO4 (33.7 ml, 633 mmol) at 0° C., followed by slow addition of 3,5-difluorobenzonitrile (4.4 g, 31.6 mmol). The suspension was stirred at this temperature for an additional 3 hours and quenched with ice water (500 ml). The resulting solid was collected by filtration and dried to give the title compound (5.55 g, 95%) as a white solid. 1H NMR (400 MHz, CDCl3) 7.43 (m, 1H), 7.35 (m, 1H).

1. customquenched with ice water (500 ml)
2. filtrationThe resulting solid was collected by filtration
3. customdried