反应详情

10 g of 8-α-hydroxyethylcaffeine (Arch. der Pharmazie, 289, 453, 1956) are added and under shaking with 100 ml of thionyl chloride. After 6 hours of reflux, the excess of reagent is evaporated to dryness under reduced pressure and the solid residue washed with petroleum ether. Nearly pure 8-α-chloroethylcaffeine is obtained with a quantitative yield, melting at 190° C from anhydrous benzene.

1. temperatureAfter 6 hours of reflux
2. customthe excess of reagent is evaporated to dryness under reduced pressure
3. washthe solid residue washed with petroleum ether