Reaktion #66656

Reaktionsgleichung

3,4-dihydroxy benzaldehyde

bromine

H2O

→

3-bromo-4,5-dihydroxy-benzaldehyde

Ausbeute 48.0%

Lösungsmittel

AcOH

AcOH

Reaktionsbedingungen

Aufarbeitung

1. 1
   FiltrationThe precipitate was filtered
2. 2
   Waschenwashed with cold H2O
3. 3
   Sonstigedried in vacuum

Vorschrift

To a solution of 3,4-dihydroxy benzaldehyde (15.48 g, 112 mmol) in 500 ml AcOH was added bromine (6.1 ml, 118 mmol) drop-wise in 50 ml AcOH over 10 min. After 4 h the mixture was poured into cold H2O. The precipitate was filtered, washed with cold H2O and dried in vacuum to give 3-bromo-4,5-dihydroxy-benzaldehyde (11.64 g, 48%) as a grey solid.

Quelle