反应详情

3.0 g of anilide of phenylthio-phenyl acetic acid (colourless needles in a mixture of benzene and petroleum ether mp 142°-143°) in 130 g of polyphosphoric acid are heated to 100° for 19 hours. The cooled reaction mixture is poured onto water, made alkaline by concentrated ammonia and extracted with methylene chloride. By drying over sodium sulphate and evaporating the extracts of methylene chloride, 1.7 g (60.0% of theory) of yellow oil are obtained which are recrystallized in ethanol: 1.5 g (45% of theory) of yellow crystals, mp 150°-151° (ethanol).

1. temperatureare heated to 100° for 19 hours
2. customThe cooled reaction mixture
3. additionis poured onto water
4. extractionextracted with methylene chloride
5. dry with materialBy drying over sodium sulphate
6. customevaporating the extracts of methylene chloride, 1.7 g (60.0% of theory) of yellow oil
7. customare obtained which
8. customare recrystallized in ethanol