反应详情

m-Chlorofluorobenzene (240 g. 1.85 moles) is added to a mixture of sulfuric acid (185 g. 1.85 moles) and nitric acid (166 g., 1.85 moles) at -5° C. in 3.5 hours, stirred 13 hours, then benzene (200 ml.) and hexane (200 ml.) are added. The extract is washed with water (1×300 ml.), sodium carbonate solution (1×300 ml.), and water (1×300 ml.), dried and the solvents removed. The residue is distilled to give 138 g. of mixed isomers. The 4-nitro isomer crystallizes and is filtered off to give 3-chloro-4-nitrofluorobenzene (51 g. 16.7%) m.p. 36°-38° C.

1. washThe extract is washed with water (1×300 ml.), sodium carbonate solution (1×300 ml.), and water (1×300 ml.)
2. customdried
3. customthe solvents removed
4. distillationThe residue is distilled
5. customto give 138 g
6. customThe 4-nitro isomer crystallizes
7. filtrationis filtered off