Acetone → 6-Acetoxy-2-hydroxy-2,5,7,8-tetramethylchroman

HRID 268404ノート

反応式

HRID 268404 の反応式
[C:1]([O:4][C:5]1[C:6]([CH3:20])=[C:7]2[C:12](=[C:13]([CH3:16])[C:14]=1[CH3:15])[O:11][C:10]([O:18]C)([CH3:17])[CH2:9][CH2:8]2)(=[O:3])[CH3:2].CC(C)=O.Cl>O>[C:1]([O:4][C:5]1[C:6]([CH3:20])=[C:7]2[C:12](=[C:13]([CH3:16])[C:14]=1[CH3:15])[O:11][C:10]([OH:18])([CH3:17])[CH2:9][CH2:8]2)(=[O:3])[CH3:2]

参加物

5

反応物 3

HCID 180AcetoneHCID 313Hydrochloric AcidHCID 144156636-Acetoxy-2-methoxy-2,5,7,8-tetramethylchroman

生成物 1

HCID 144156666-Acetoxy-2-hydroxy-2,5,7,8-tetramethylchroman

試薬・触媒・溶媒 1

HCID 962Water溶媒

反応条件

温度
50 °C

実験手順

To a solution of (±)-6-acetoxy-2-methoxy-2,5,7,8-tetramethylchroman in 2500 ml. of acetone was added 2000 ml. of H2O followed by 16.6 ml. of concentrated aqueous HCl. Solvent was distilled from the stirred mixture until the head temperature reached 90°C. The suspension was cooled in an H2O bath to 50°C. At 70°C., 2000 ml. of acetone was added, giving a clear solution. The solution was seeded occasionally until crystallization began. After 3.5 hours, 1500 ml. of H2O was added and the suspension was cooled in an ice bath. The solid was removed by filtration, washed with H2O and dried at 50°C./0.1 mmHg. to give (±)-6-acetoxy-2-hydroxy-2,5,7,8-tetramethylchroman as a granular yellow-tan solid, sintering from 114°C., m.p. 127°-132°C.

後処理

  1. distillationSolvent was distilled from the stirred mixture until the head temperature
  2. customreached 90°C
  3. customAt 70°C.
  4. additionof acetone was added
  5. customgiving a clear solution
  6. customThe solution was seeded occasionally until crystallization
  7. additionof H2O was added
  8. temperaturethe suspension was cooled in an ice bath
  9. customThe solid was removed by filtration
  10. washwashed with H2O
  11. customdried at 50°C./0.1 mmHg

出典と根拠

ORDレコード
ord-9b01473f7d844bd992f6974962afc07c
出典データセット
uspto-grants-1976_03
特許番号
US03947473

反応ノート

読み込み中…