p-Toluenesulfonic acid → HCID 21417759, compound

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Reaction Steps

75 ml of dichloromethane is placed into a 100 ml round-bottom flask. To the dichloromethane is added 5.3 grams (0.05 moles) of 4-mercapto-2-butanol. 7.14 grams (0.055 moles) ethyl acetoacetate is then added followed by 0.1 grams of p-toluene sulfonic acid. Boiling chips are added to the flask. A Dean-Starke distilling receiver is placed on the flask, and a reflux condenser is placed on the receiver. The flask is then heated slowly until reflux occurs, and then the temperature is increased for a more vigorous reflux. The reflux lasts for a period of 2 hours before water of reaction ceases to be formed. The reaction mass is then cooled and neutralized with 10% aqueous sodium bicarbonate to a pH of 8. The reaction mass is filtered through fluted filter paper, and the dichloromethane solvent by means of rotary evaporation. 9.8 grams of crude product are recovered after the rotary evaporation operation. The crude product is then distilled by means of vacuum distillation yielding the following 4 fractions:

Provenance & Evidence