Reaktion #482030

Reaktionsgleichung

DMF

Triphenyl amine

Phosphorus oxychloride

sodium hydroxide

→

4-diphenylaminobenzaldehyde

Ausbeute 84.0%

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturAfter cooling to room temperature
2. 2
   workup.ADDITIONthe reaction is slowly poured onto ice-cold water (8 liters) with vigorous stirring
3. 3
   workup.STIRRINGstirring
4. 4
   workup.WAITis continued for one hour
5. 5
   FiltrationThe obtained precipitate is filtered off
6. 6
   Waschenwashed with water (2 liters)
7. 7
   Trocknenwith methanol (2 litres) and dried

Vorschrift

Triphenyl amine (98.32 g, 0.393 mol) is suspended in DMF (280 ml). Phosphorus oxychloride (66.24 g, 0.432 mol) is added dropwise to it over a 30-minutes period without external cooling. After stirring for one more hour, the reaction is heated to 80° C. (bath temperature) for 2 ½ hours. After cooling to room temperature, the reaction is slowly poured onto ice-cold water (8 liters) with vigorous stirring. After 30 minutes, aqueous sodium hydroxide (5 N, 250 ml) is added to the reaction, and stirring is continued for one hour. The obtained precipitate is filtered off, washed with water (2 liters), then with methanol (2 litres) and dried to give 4-diphenylaminobenzaldehyde as a beige solid (90.47 g, 0.331 mol, 84%), which is used in the next step without further purification.

Quelle