Thionyl Chloride → 2,5-Dichlorophenylthioglycoloyl chloride

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

94.8 g of 2,5-dichlorophenylthioglycolic acid are added to 103.2 g of thionyl chloride. 0.24 g of N-methylpyrrolidone is added, and the mixture is heated at 50° C. for 2 hours and is then cooled down to 0° C. At this temperature the 2,5-dichlorophenylthioglycoloyl chloride formed is then added dropwise in the course of 1 hour to a suspension of 160 g of thionyl chloride and 77.2 g of anhydrous aluminum chloride. The suspension is stirred at 0°-5° C. for 1 hour and is then poured onto a mixture of 1,200 g of ice and 800 ml of water, the resulting mixture is stirred at 80° C. for 1 hour and is then filtered with suction, and the filter cake is washed until neutral and dried in vacuo at 50° C. This gives 88.4 g of 94.5% pure 4,7-dichloro-3-oxythionaphthene.

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