Reaktion #1050964

Reaktionsgleichung

pentafluorobenzoic acid

calcium hydroxide

→

pentafluorobenzene

Lösungsmittel

ethylene glycol

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeIn a three-necked flask provided with a stirring device, a reflux condenser
2. 2
   Temperaturheated
3. 3
   Sonstigethe ensuant reaction
4. 4
   Sonstigelevel of 140° C.
5. 5
   Sonstigeto the terminal level of 110° C

Vorschrift

In a three-necked flask provided with a stirring device, a reflux condenser, and a thermometer, 13.90 g (66 m.mols) of pentafluorobenzoic acid, 40 g of ethylene glycol, and 0.82 g (11 m.mols) of calcium hydroxide were placed and heated and the ensuant reaction was continued for 6 hours, with the reaction temperature gradually lowered meanwhile from the initial level of 140° C. to the terminal level of 110° C. After the reaction was completed, pentafluorobenzene was isolated by distillation. By the distillation, pentafluorobenzene was obtained in an amount of 8.02 g (48 m.mols), i.e. in a yield of 72.8%. By gas chromatography, the product was found to have purity of not less than 99.0%. The solution remaining after the distillation could be recycled through the subsequent cycle of reaction, though the pentafluorobenzoic acid as the starting material remained in the solution.

Quelle