反应详情

温度

80 °C

N-(3-Fluoro-4-isopropyl-phenyl)-N'-methyl-urea (one mol=210 g.) and polyoxymethylene (1 mol=90 g.) are dissolved in toluene (800 cc.) in the presence of para-toluenesulphonic acid (0.3 mol=51.6 g.) as a catalyst and of dimethylformamide (0.3 mol=22 g.), and the mixture is heated for 15 minutes at 80° C. After having washed the solution with water and then concentrated it, 3-(3-fluoro-4-isopropyl-phenyl)-5-methyltetrahydro-1,3,5-oxadiazin-4-one is obtained in the form of an oil which is purified by dissolving in hot hexane and recrystallising.

1. washAfter having washed the solution with water
2. concentrationconcentrated it