反応 #6511

反応方程式

p-hydroxybenzaldehyde

acetic anhydride

p-Nitrophenylacetic acid

sodium hydroxide

→

a-p-Nitrophenyl-p-acetoxycinnamic Acid

溶媒

water

ethanol

反応条件

後処理

1. 1
   温度heated
2. 2
   その他The resultant solution is rotary evaporated under vacuum until final conditions of 110° C. and 1 mm Hg
3. 3
   温度maintained for 30 minutes
4. 4
   workup.ADDITIONare added to a reactor
5. 5
   その他equipped with a reflux condenser
6. 6
   workup.STIRRINGstirred under a nitrogen atmosphere at a 147° C.
7. 7
   温度reflux
8. 8
   温度Refluxing
9. 9
   その他continued over the next twenty hours at which time
10. 10
    温度has increased to 159° C
11. 11
    温度At this time, the reactor is cooled to 100° C.
12. 12
    その他for one hour
13. 13
    温度by cooling to 50 ° C.
14. 14
    ろ過filtration
15. 15
    workup.ADDITIONThe filtrate is added to deionized water (1500 mL)
16. 16
    ろ過the resultant precipitate recovered by filtration
17. 17
    抽出The precipitate is exhaustively extracted with deionized water saturated with sodium carbonate
18. 18
    ろ過The combined extracts are filtered
19. 19
    ろ過The precipitate is recovered by filtration
20. 20
    その他then dried at 50° C. in a forced air convection type oven
21. 21
    workup.ADDITIONThe dry powder is added to a beaker along with carbon tetrachloride (200 mL)
22. 22
    workup.STIRRINGthen stirred
23. 23
    温度with heating to a boil
24. 24
    workup.ADDITIONAcetic acid (40 mL) is added to the boiling slurry
25. 25
    温度then heating back to a boil
26. 26
    温度the slurry is maintained at 4° C. for 15 hours
27. 27
    ろ過The precipitate is recovered by filtration
28. 28
    乾燥dried at 70° C. under a vacuum of 5 mm Hg to a constant weight of 38.55 grams of brilliant light yellow colored crystalline powder

実験手順

p-Nitrophenylacetic acid (94.02 grams, 0.519 mole) and 1.038 N sodium hydroxide solution (500 mL) are added to a 1,000 mL beaker and heated with stirring to 60° C. The resultant solution is rotary evaporated under vacuum until final conditions of 110° C. and 1 mm Hg are achieved and maintained for 30 minutes. A portion (101.6 grams, 0.50 mole) of the resultant dry white carboxylic acid sodium salt, p-hydroxybenzaldehyde (61.06 grams, 0.50 mole) and acetic anhydride (250 grams) are added to a reactor equipped with a reflux condenser and stirred under a nitrogen atmosphere at a 147° C. reflux. Refluxing continued over the next twenty hours at which time the temperature has increased to 159° C. At this time, the reactor is cooled to 100° C. and ethanol (300 mL) and water (50 mL) are added. The resultant slurry is boiled at 89° C. for one hour followed by cooling to 50 ° C. and filtration. The filtrate is added to deionized water (1500 mL) and the resultant precipitate recovered by filtration. The precipitate is exhaustively extracted with deionized water saturated with sodium carbonate. The combined extracts are filtered then neutralized with concentrated hydrochloric acid inducing formation of a precipitate. The precipitate is recovered by filtration then dried at 50° C. in a forced air convection type oven. The dry powder is added to a beaker along with carbon tetrachloride (200 mL) then stirred with heating to a boil. Acetic acid (40 mL) is added to the boiling slurry then heating back to a boil resumed. After boiling is achieved, the slurry is maintained at 4° C. for 15 hours. The precipitate is recovered by filtration and dried at 70° C. under a vacuum of 5 mm Hg to a constant weight of 38.55 grams of brilliant light yellow colored crystalline powder.

出典