Reaktion #355278

Reaktionsgleichung

HCl

Furfural

p-anisidine

sodium nitrite

→

black semi-solid

Ausbeute 23.1%

5-(4-Methoxyphenyl)-2-furaldehyde

Ausbeute 23.1%

Lösungsmittel

water

water

water

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigethree-necked flask equipped with stirrer
2. 2
   workup.ADDITIONwas introduced
3. 3
   Temperaturmaintaining -10° to -5°C
4. 4
   Extraktionthe reaction mixture was extracted with ether (1800 ml)
5. 5
   TrocknenThe dried (MgSO4)
6. 6
   Extraktionextract
7. 7
   Sonstigewas evaporated in a rotary evaporator
8. 8
   workup.DISTILLATIONthe residue was distilled under reduced pressure

Vorschrift

A 5l. three-necked flask equipped with stirrer, thermometer and dropping funnel was charged with water (150ml), concentrated HCl (400 ml) was introduced, followed by p-anisidine (185 g, 1.5 moles). A solution of sodium nitrite (108 g, 1.56 moles) in water (300 ml) was introduced dropwise maintaining -10° to -5°C. Furfural (184 g, 1.92 moles) was introduced followed by a solution of CuCl2.2H2O (46 g) in water (300 ml). The reaction mixture was heated to 53° with hot water maintaining 53°-68° for 2.5 hours. After cooling to room temperature overnight, the reaction mixture was extracted with ether (1800 ml). The dried (MgSO4) extract was evaporated in a rotary evaporator, and the residue was distilled under reduced pressure to give 70 g of black semi-solid product (b.p. 160°-190° at 2-5 mm).

Quelle