反应详情

A mixture of 0.374 mole of o-dipropylbenzene, 146 g. (0.822 mole) of N-bromosuccinimide, 0.1 g. of benzoyl peroxide, and 800 ml. of carbon tetrachloride is heated under reflux with stirring and ultraviolet irradiation until the reaction is complete. The precipitated succinimide is filtered, washed with carbon tetrachloride, and the filtrate is evaporated to dryness under reduced pressure. The residual α,α'-dibromo-o-dipropylbenzene is dissolved in 800 ml. of absolute ether. To the stirred solution under nitrogen is added dropwise a solution of 40 g. (0.87 mole) of methyl hydrazine in 50 ml. of absolute ether. A gummy precipitate separates. After 3 hours of stirring and an overnight period of standing, the ether is decanted. The residue dissolved in 625 ml. of water is treated with 375 ml. of 40% sodium hydroxide solution and the mixture is stirred at reflux for 1.5 hours. After cooling, the precipitate of the crude product is collected, washed with water, and dissolved in 600 ml. of ether. The ether solution is washed repeatedly with water and dried over anhydrous magnesium sulfate with stirring and cooling in an ice bath. The filtered solution is evaporated under reduced pressure and the residual dark yellow solid is triturated with petroleum ether, filtered and dried in vacuo to yield 1,3-diethyl-2-methylisoindole.

1. temperatureunder reflux
2. customultraviolet irradiation until the reaction
3. filtrationThe precipitated succinimide is filtered
4. washwashed with carbon tetrachloride
5. customthe filtrate is evaporated to dryness under reduced pressure
6. dissolutionThe residual α,α'-dibromo-o-dipropylbenzene is dissolved in 800 ml
7. additionTo the stirred solution under nitrogen is added dropwise a solution of 40 g
8. stirringAfter 3 hours of stirring and an overnight period
9. customthe ether is decanted
10. dissolutionThe residue dissolved in 625 ml
11. additionof water is treated with 375 ml
12. stirringof 40% sodium hydroxide solution and the mixture is stirred
13. temperatureat reflux for 1.5 hours
14. temperatureAfter cooling
15. customthe precipitate of the crude product is collected
16. washwashed with water
17. dissolutiondissolved in 600 ml
18. washThe ether solution is washed repeatedly with water
19. dry with materialdried over anhydrous magnesium sulfate
20. stirringwith stirring
21. temperaturecooling in an ice bath
22. customThe filtered solution is evaporated under reduced pressure
23. customthe residual dark yellow solid is triturated with petroleum ether
24. filtrationfiltered
25. customdried in vacuo