Reaktion #302847

Reaktionsgleichung

compound 3

1-(5-bromo-2-hydroxyphenyl)-3-(4-nitrophenyl)propan-1,3-dione

sulfuric acid

→

compound 4

6-bromo-4′-nitroflavone

Lösungsmittel

acetic acid

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturwas heated
2. 2
   Temperaturto reflux for 1 hour
3. 3
   Sonstigewas returned to room temperature
4. 4
   workup.ADDITIONice pieces were then added to the reaction solution
5. 5
   FiltrationThe precipitated crystal was collected by filtration

Vorschrift

A mixed solution consisting of compound 3 (2.00 g, 5.49 mmol), concentrated sulfuric acid (0.5 ml), and acetic acid (40 ml) was heated to reflux for 1 hour. The temperature of the resultant was returned to room temperature, and ice pieces were then added to the reaction solution. The precipitated crystal was collected by filtration, so as to obtain a product of interest, 6-bromo-4′-nitroflavone (compound 4). Yield: 1.79 g (yield constant: 94.2%) MS m/z 347 (MH+).

Quelle