反应详情

27.2 g of N-(3',4'-dichlorophenyl)-3,4-dimethyl-2-hydroxy-5-oxo-2,5-dihydropyrrole (see Example 3) is added to 25 ml of thionyl chloride, with an intense evolution of gas occurring. After being stirred for one hour at 50°, the mixture is concentrated by evaporation in vacuo. The solid residue is triturated with petroleum ether to obtain 27.4 g (95% of theory) of the above compound in the form of light-yellow crystals, m.p. 95°-96°.

1. concentrationthe mixture is concentrated by evaporation in vacuo
2. customThe solid residue is triturated with petroleum ether
3. customto obtain 27.4 g (95% of theory) of the above compound in the form of light-yellow crystals, m.p. 95°-96°