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A mixture of 5.0 g of tetrahydrothiopyran-4-one, 2.5 ml of ethylene glycol, 0.230 g of p-toluenesulfonic acid and 125 ml of benzene is stirred at reflux temperature for 2.5 hours. The water formed is removed using a Dean-Stark trap. The reaction is treated with saturated sodium bicarbonate, water, saturated sodium chloride, dried and concentrated in vacuo to give 6.52 g of the desired product as an oil.

1. temperatureat reflux temperature for 2.5 hours
2. customis removed
3. additionThe reaction is treated with saturated sodium bicarbonate, water, saturated sodium chloride
4. customdried
5. concentrationconcentrated in vacuo