Hydrochloric Acid → 1-(4-Bromo-2,5-difluorophenyl)ethan-1-one

HRID 1957483

Reaktionsgleichung

Reaktionsgleichung von HRID 1957483
[C:1](Cl)(=[O:3])[CH3:2].[Br:5][C:6]1[CH:11]=[C:10]([F:12])[CH:9]=[CH:8][C:7]=1[F:13].[Cl-].[Cl-].[Cl-].[Al+3].Cl>>[Br:5][C:6]1[C:7]([F:13])=[CH:8][C:9]([C:1](=[O:3])[CH3:2])=[C:10]([F:12])[CH:11]=1

Komponenten

5

Edukt 4

HCID 313Hydrochloric AcidHCID 6367Acetyl chlorideHCID 678622-Bromo-1,4-difluorobenzeneHCID 6451240Aluminum(III) Chloride

Produkt 1

HCID 99916531-(4-Bromo-2,5-difluorophenyl)ethan-1-one

Reaktionsbedingungen

Temperatur
60 °C

Versuchsvorschrift

Acetyl chloride (17 ml) is slowly dropped into a stirred mixture of 1-bromo-2,5-difluorobenzene (30 g) and aluminium trichloride (53 g) heated at 60° C. and kept under argon. The reaction mixture is then stirred 90 minutes at 95° C. The mixture is cooled at 40° C. and carefully poured into crushed ice (400 g) and concentrated hydrochloric acid (35 ml). The resulting mixture is stirred a few minutes and then extracted with ethyl ether (2×250 ml). The ethereal solution is washed to neutral with brine, dried over sodium sulfate and the solvent is evaporated. The distillation of the oily residue gives 4'-bromo-2 ',5'-difluoroacetophenone (21.2 g) b.p. (0.05 mm)=60° C.

Aufarbeitung

  1. temperatureThe mixture is cooled at 40° C.
  2. additioncarefully poured
  3. stirringThe resulting mixture is stirred a few minutes
  4. extractionextracted with ethyl ether (2×250 ml)
  5. washThe ethereal solution is washed to neutral with brine
  6. dry with materialdried over sodium sulfate
  7. customthe solvent is evaporated
  8. distillationThe distillation of the oily residue

Quellen und Nachweise

ORD-Eintrag
ord-198b147a0184444fb062f6bd53d235b0
Quelldatensatz
uspto-grants-1998_07
Patentnummer
US05786350

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