Carbon Dioxide → 1-(4-Chlorophenyl)-2-phenyl-1,2-ethanedione

HRID 436383

Reaktionsgleichung

Reaktionsgleichung von HRID 436383
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]([CH2:10][C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=2)=[O:9])=[CH:4][CH:3]=1.[Mn]([O-])(=O)(=O)=[O:18].[K+].C(=O)=O>N1C=CC=CC=1>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([C:8]([C:10]([C:11]2[CH:12]=[CH:13][CH:14]=[CH:15][CH:16]=2)=[O:18])=[O:9])=[CH:6][CH:7]=1

Komponenten

5

Edukt 3

HCID 280Carbon DioxideHCID 2338404'-Chloro-2-phenylacetophenoneHCID 516875Potassium Permanganate

Produkt 1

HCID 898011-(4-Chlorophenyl)-2-phenyl-1,2-ethanedioneAusbeute 25,1 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 1049PyridineLösungsmittel

Versuchsvorschrift

A benzene solution containing 51.2 g 4-chlorophenylacetic acid and 39.3 g thionyl chloride is refluxed for 6 hours and the solvent removed. The crude reaction product is added dropwise to a slurry of 40 g aluminum chloride in 200 ml benzene maintaining the temperature below 50° C. After addition the reaction is refluxed for 1.5 hours. After cooling, the mixture is poured into ice and the resulting white solid is separated yielding 61.3 g of crude product. The product is taken up in methylene chloride and washed with 5% sodium hydroxide solution followed by water, dried over sodium sulfate and stripped yielding 49.3 g (71%) of >95% pure 4'-chlorodeoxybenzoin. 15 g of 4-chlorodeoxybenzoin is dissolved in 105 ml pyridine. An aqueous solution containing 15 g potassium permanganate is added and the reaction stirred for 6 hours at room temperature using dry ice to buffer the pH near 7. The mixture is extracted with methylene chloride, the extract washed with water, dried over Na2SO4 and stripped. The residue is recrystallized from ethanol yielding 6.1 g of white plate-like crystals which is identified as starting material. Concentration of the mother liquor yields 4 g of 4-chlorobenzil.

Aufarbeitung

  1. additionis added
  2. extractionThe mixture is extracted with methylene chloride
  3. washthe extract washed with water
  4. dry with materialdried over Na2SO4
  5. customThe residue is recrystallized from ethanol yielding 6.1 g of white plate-like crystals which

Quellen und Nachweise

ORD-Eintrag
ord-dfd28d84b7804ff2b60163e55c9ac0ab
Quelldatensatz
uspto-grants-1977_02
Patentnummer
US04009022

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