反应详情

The yield of 2,6-dimethyl-4-propoxyazobenzene (20.2 g) from the previous step was dissolved in 95% alcohol (175 ml). Water was added (160 ml) and the mixture was heated to reflux. Sodium hydrosulfite (Na2S2O4) (44.8 g) was added to the boiling solution in small portions. After completion of this addition, reflux was continued for 30-60 min. The alcohol was removed by distillation at reduced pressure. The remaining heterogeneous residue was made alkaline and was extracted with ether. The ether extract was dried (Na2SO4), filtered, and evaporated. The residual oil was fractionated by distillation in vacuo. After a forerun of aniline, the desired product distilled at 101° C. (0.7 mmHg); nD25 =1.5393. The yield of 2,6-dimethyl-4-propoxyaniline was 6.86 g (51%).

1. temperaturethe mixture was heated to reflux
2. additionAfter completion of this addition
3. temperaturereflux
4. customThe alcohol was removed by distillation at reduced pressure
5. extractionwas extracted with ether
6. extractionThe ether extract
7. dry with materialwas dried (Na2SO4)
8. filtrationfiltered
9. customevaporated
10. distillationThe residual oil was fractionated by distillation in vacuo
11. distillationAfter a forerun of aniline, the desired product distilled at 101° C. (0.7 mmHg)