Reaktion #43993

Reaktionsgleichung

1,4-Diethoxy-2,3-naphthalenedicarboxylic acid

thionyl chloride

→

1,4-diethoxy-2,3-naphthalenedicarboxylic anhydride

Ausbeute 99.3%

Lösungsmittel

chloroform

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturat reflux for 1 h
2. 2
   TemperaturThe resulting solution was cooled
3. 3
   Sonstigeevaporated to dryness
4. 4
   workup.ADDITIONFurther chloroform was added
5. 5
   Sonstigeevaporation

Vorschrift

1,4-Diethoxy-2,3-naphthalenedicarboxylic acid (25 g, 82 mmol) was added to a solution of thionyl chloride (23.3 g) in chloroform (150 ml) and stirred at reflux for 1 h. The resulting solution was cooled and evaporated to dryness. Further chloroform was added and evaporation repeated to give 1,4-diethoxy-2,3-naphthalenedicarboxylic anhydride as a yellow solid (23.3 g, 99%).

Quelle