Hydrochloric Acid → 3-(2-Chlorophenyl)propanoic acid

HRID 265814

反応式

HRID 265814 の反応式
[Cl:1][C:2]1[CH:19]=[CH:18][CH:17]=[CH:16][C:3]=1[CH2:4][CH:5](C(OCC)=O)[C:6]([O:8]CC)=[O:7].Cl>C(O)(=O)C>[Cl:1][C:2]1[CH:19]=[CH:18][CH:17]=[CH:16][C:3]=1[CH2:4][CH2:5][C:6]([OH:8])=[O:7]

参加物

4

反応物 2

HCID 313Hydrochloric Acid2 回HCID 12661049Diethyl 2-(2-chlorobenzyl)malonate

生成物 1

HCID 956763-(2-Chlorophenyl)propanoic acid収率 93.4%

試薬・触媒・溶媒 1

HCID 176Acetic Acid溶媒

実験手順

To a 50 liter flask was added diethyl o-chlorobenzylmalonate (6067 g, 21.31 mol), glacial acetic acid (1090 mL), and concentrated hydrochloric acid (16,000 mL). The reaction was then heated at reflux for 21 hours and 13 minutes. Additional concentrated hydrochloric acid (1840 mL, 5520 mL total) was added at 3.5, 13.5, and 17 hours into the reflux. The reaction was cooled to 0°±2° C. and the resulting solid was collected by suction filtration and washed with water (4L). The solid was suspended in water (8L) and the slurry was stirred for five minutes. The solid was collected by suction filtration and washed with water (20L). The filtrate was pH 2 and tested positive for chlorine. The solid was then washed seven times in the following manner; the solid was suspended in water (8L) and stirred for approximately ten minutes. The solid was collected by suction filtration and washed with water (4L). The filtrate was tested for chloride ion and the pH was recorded. The final filtrate was pH 4.5-5 and tested negative to the presence of chloride ion. A total of 100 liters of water was used to wash the solid. The solid was dried under vacuum at 35°±3° C. for 70 hours to give crude β-2-chlorophenylpropionic acid (3653 g, 93.4%) as a white solid.

後処理

  1. temperatureThe reaction was then heated
  2. temperatureat reflux for 21 hours and 13 minutes
  3. temperatureThe reaction was cooled to 0°±2° C.
  4. filtrationthe resulting solid was collected by suction filtration
  5. washwashed with water (4L)
  6. filtrationThe solid was collected by suction filtration
  7. washwashed with water (20L)
  8. washThe solid was then washed seven times in the following manner
  9. stirringstirred for approximately ten minutes
  10. filtrationThe solid was collected by suction filtration
  11. washwashed with water (4L)
  12. washto wash the solid
  13. customThe solid was dried under vacuum at 35°±3° C. for 70 hours

出典と根拠

ORDレコード
ord-f14791af7ccd4ff8bc28730454759608
出典データセット
uspto-grants-1997_07
特許番号
US05648540

関連ノート

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