反应详情

17.0 g of a 50% strength alkaline suspension of Raney nickel were filtered under a nitrogen atmosphere and the material on the filter was washed until neutral. The Raney nickel obtained by this method was suspended in 150 ml of formic acid. 20.0 g (0.1 mole) of 3-bromo-4-fluoro-benzonitrile were added to this suspension. The mixture was heated at 80° to 90° C. for 3 to 5 hours and the reaction mixture was then cooled and poured into 300 ml of water. After filtering, the filtrate was twice extracted with, in each case, 200 ml of toluene. The toluene phase was dried over sodium sulphate and then concentrated. 17.2 g (85% of theory) of 3-bromo-4-fluoro-benzaldehyde with a boiling point of 63°-65° C./0.3 mm Hg were obtained.

1. filtrationwere filtered under a nitrogen atmosphere
2. washthe material on the filter was washed until neutral
3. customThe Raney nickel obtained by this method
4. temperatureThe mixture was heated at 80° to 90° C. for 3 to 5 hours
5. temperaturethe reaction mixture was then cooled
6. filtrationAfter filtering
7. extractionthe filtrate was twice extracted with, in each case, 200 ml of toluene
8. dry with materialThe toluene phase was dried over sodium sulphate
9. concentrationconcentrated