Water → 6-Bromo-3,4-dimethoxybenzaldehyde

HRID 613029

Reaktionsgleichung

Reaktionsgleichung von HRID 613029
[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:8]=[CH:9][C:10]=1[O:11][CH3:12])[CH:6]=[O:7].[Br:13]Br.O>C(O)(=O)C>[Br:13][C:8]1[C:5]([CH:6]=[O:7])=[CH:4][C:3]([O:2][CH3:1])=[C:10]([O:11][CH3:12])[CH:9]=1

Komponenten

5

Edukt 3

HCID 962WaterHCID 8419VeratraldehydeHCID 24408Bromine2×

Produkt 1

HCID 793516-Bromo-3,4-dimethoxybenzaldehyde

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 176Acetic AcidLösungsmittel

Versuchsvorschrift

3,4-Dimethoxybenzaldehyde (398.8 g) is dissolved in acetic acid (1.8 liter), and thereto is added dropwise bromine (136 ml) at room temperature over a period of four hours. The mixture is stirred overnight, and thereto is added dropwise slowly again bromine (60 ml), and the mixture is stirred overnight. The reaction solution is added to water (7 liters), and the precipitated crystals are collected by filtration, washed with water, and dissolved in chloroform (2 liters). The chloroform solution is washed, dried, concentrated, and the residue is crystallized from diisopropyl ether to give 6-bromo-3,4-dimethoxybenzaldehyde (470 g) as a colorless crystal.

Aufarbeitung

  1. stirringthe mixture is stirred overnight
  2. filtrationthe precipitated crystals are collected by filtration
  3. washwashed with water
  4. dissolutiondissolved in chloroform (2 liters)
  5. washThe chloroform solution is washed
  6. customdried
  7. concentrationconcentrated
  8. customthe residue is crystallized from diisopropyl ether

Quellen und Nachweise

ORD-Eintrag
ord-16c7c1bee46443039c28bad0e39a7dec
Quelldatensatz
uspto-grants-1999_12
Patentnummer
US06005106

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