反应详情

A solution of the 3-bromo-2,4,5-trifluorobenzoic acid (2.5 g) in thionyl chloride (10 ml) was refluxed for 2.5 hours, and then concentrated. The resulting residue was purified by distillation through Widmer fractionating column to give the title compound (2.3 g), bp 98°-102° C./18 mmHg.

1. concentrationconcentrated
2. distillationThe resulting residue was purified by distillation through Widmer fractionating column