反应详情

To 2,3-difluoro-benzoic acid (3 g) was added to a solution of chlorosulfonic acid and the reaction mixture was stirred for 2 hours at room temperature. After such time, the reaction mixture was poured onto ice. The resulting solid precipitate was then filtered off and dried in vacuo to yield the title compound as a light grey solid (4.8 g, mp=109-114° C., MS (EI): 256.0 (M+) and was used directly in the next step without any further purification.

1. additionAfter such time, the reaction mixture was poured onto ice
2. filtrationThe resulting solid precipitate was then filtered off
3. customdried in vacuo