反应详情

4-Bromo-2,6-dimethylaniline (24.0 parts), 3% palladium on charcoal (50% paste; 2.0 parts), cetyltrimethylammonium bromide (4.0 parts), sodium hydroxide liquor (32%; 13.5 parts), sodium formate (6.8 parts) in water (60 parts) are stirred at the boil under reflux for 3 hours. Sodium formate (6.8 parts is then added and the mixture boiled for 3 hours when a further charge of sodium formate (6.8 parts) is made. The reaction mixture is then held at the boil under reflux for a further 23 hours. The mixture is then steam distilled and from the distillate 2.2 parts (18.2%) of 2,6-dimethylaniline is recovered by extraction with ether. The reaction mixture after steam distillation is cooled to room temperature and then filtered. The residue is extracted continuously with methanol (60 parts) for 5 hours and then the extract cooled. The colourless crystalline precipitate is filtered off and dried to give 7.7 parts (63.3%) of 3,3',5,5'-tetramethyl benzidine.

1. temperatureunder reflux for 3 hours
2. temperatureunder reflux for a further 23 hours
3. distillationsteam distilled and from the distillate 2.2 parts (18.2%) of 2,6-dimethylaniline
4. customis recovered by extraction with ether
5. distillationThe reaction mixture after steam distillation
6. filtrationfiltered
7. extractionThe residue is extracted continuously with methanol (60 parts) for 5 hours
8. temperaturethe extract cooled
9. filtrationThe colourless crystalline precipitate is filtered off
10. customdried