反应详情

Nitrosonium tetrafluoroborate (905 mg, 7.75 mmol, 1.00 equiv) was added to a solution of 2,5-difluoroaniline (0.780 mL, 7.75 mmol, 1 equiv) in acetonitrile (50 mL) at 0° C. The resulting mixture was stirred for 1 h, then diluted with ethyl ether (150 mL). The precipitate was filtered and air dried to give 2,5-difluorobenzenediazonium tetrafluoroborate (2-1) as a tan solid. 1H NMR (300 MHz, CD3OD) δ 8.54 (m, 1H), 8.24 (m, 1H), 7.95 (m, 1H).

1. filtrationThe precipitate was filtered
2. customair dried