反应详情

In a 20 L-volume glass reaction vessel equipped with a stirrer, a thermometer and a reflux condenser, the acetic acid solution containing 2,023 g (6.78 moles) of ethyl 3,4-bis(2-methoxyethoxy)benzoate prepared in the Synthesis Example 1 was placed. To the solution, 318 g (3.18 moles) of concentrated sulfuric acid was gently added while stirring the solution at room temperature. The mixture was heated to 60 to 70° C. To the mixture, 1,857 g (20.34 moles) of 69 wt. % nitric acid was gently added while stirring the mixture. The resulting mixture was allowed to react for 2 hours while maintaining the temperature. After the reaction was complete, the reaction solution was cooled to room temperature. To the reaction solution, 5,200 mL of a 20 wt. % aqueous sodium chloride solution and 5,200 mL of toluene were added. The separated organic layer (toluene layer) was washed twice with 7,800 mL of a 1 mole per L aqueous sodium hydroxide solution, and further washed twice with 7,800 mL of a 20 wt. % aqueous sodium chloride solution. The organic layer was concentrated under reduced pressure to obtain 2,328 g of ethyl 4,5-bis(2-methoxyethoxy)-2-nitrobenzoate as an orange liquid (isolation yield: 100%).

1. customIn a 20 L-volume glass reaction vessel
2. customequipped with a stirrer
3. customprepared in the Synthesis Example 1
4. temperatureThe mixture was heated to 60 to 70° C
5. stirringwhile stirring the mixture
6. customto react for 2 hours
7. temperaturewhile maintaining the temperature
8. temperaturethe reaction solution was cooled to room temperature
9. washThe separated organic layer (toluene layer) was washed twice with 7,800 mL of a 1 mole per L aqueous sodium hydroxide solution
10. washfurther washed twice with 7,800 mL of a 20 wt. % aqueous sodium chloride solution
11. concentrationThe organic layer was concentrated under reduced pressure