Chloroacetone → 3-Hydroxy-2-(2-oxopropyl)-2-cyclohexen-1-one

HRID 1252793ノート

反応式

HRID 1252793 の反応式
C([O-])([O-])=O.[K+].[K+].[C:7]1(=[O:14])[CH2:12][CH2:11][CH2:10][C:9](=[O:13])[CH2:8]1.Cl[CH2:16][C:17](=[O:19])[CH3:18].[OH-].[Na+]>C(Cl)(Cl)Cl.O>[OH:13][C:9]1[CH2:10][CH2:11][CH2:12][C:7](=[O:14])[C:8]=1[CH2:16][C:17](=[O:19])[CH3:18]

参加物

7

反応物 4

HCID 6571ChloroacetoneHCID 104341,3-CyclohexanedioneHCID 11430Potassium CarbonateHCID 14798Sodium Hydroxide

生成物 1

HCID 74817023-Hydroxy-2-(2-oxopropyl)-2-cyclohexen-1-one

試薬・触媒・溶媒 2

HCID 962Water溶媒2 回HCID 6212Chloroform溶媒2 回

実験手順

To a slurry of powdered K2CO3 (4.34 Kg, 31.4 moles) in chloroform (8.5 l), 1,3-cyclohexanedione (3.5 Kg, 31.2 moles) was added with stirring. To this mixture, at an ice-bath temperature, chloroacetone (2.9 Kg, 28.2 moles based on 90% purity) was added over a 1 hour period under a N2 atmosphere with stirring. The reaction temperature was raised slowly to room temperature and it was then allowed to stay at room temperature for 3 days. As the reaction proceeded, stirring became more and more difficult. Distilled water (2 l) was added slowly and the mixture was then transferred to an aqueous sodium hydroxide solution (1 l 50% NaOH to 6 l H2O) with stirring. Additional water (1 l) and chloroform (1 l) were used to rinse the remainer of the mixture from the reaction flask. The pH of the solution was less than 10 and additional sodium hydroxide (1 l of 50% solution) was added to bring the pH of the solution to approx. 10. After stirring for 20 minutes, the mixture was allowed to settle and the organic layer was separated. The aqueous layer was acidified with conc. hydrochloric acid solution (15 lb) and then ethyl acetate (9 l) was added. The mixture was stirred for 20 minutes, allowed to settle, and the organic layer was separated. This organic layer was washed with brine (2 l), dried over Na2SO4, and the filtrate was concentrated under reduced pressure to yield a brown oily product (approx. 4.5 l ). This material can be crystallized from ether, but may be used directly in the next step without further purification, mp 80°-81° C. (crystals obtained from ether crystallization).

後処理

  1. stirringwith stirring
  2. stirringstirring
  3. stirringwith stirring
  4. washto rinse the remainer of the mixture from the reaction flask
  5. additionwas added
  6. stirringAfter stirring for 20 minutes
  7. customthe organic layer was separated
  8. additionethyl acetate (9 l) was added
  9. stirringThe mixture was stirred for 20 minutes
  10. customthe organic layer was separated
  11. washThis organic layer was washed with brine (2 l)
  12. dry with materialdried over Na2SO4
  13. concentrationthe filtrate was concentrated under reduced pressure

出典と根拠

ORDレコード
ord-6df51a1ec1bf4301a73abaf76e245510
出典データセット
uspto-grants-1988_05
特許番号
US04745222

反応ノート

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