反应详情

3-n-Butyl-5-[4-(1,3-dioxol-2-yl)benzylidene] hydantoin (2.7 g; 0.0085 mole) was dissolved in acetone (100 ml.) and stirred overnight at room temperature with p-toluene sulphonic acid (0.5 g.). The hazy solution was evaporated in vacuo and the resultant solid suspended in water (100 ml) and neutralised to pH 7 using dilute sodium bicarbonate solution. The residual solid was filtered off, washed with water and dried to give the title compound m.p. 180° C.

1. customThe hazy solution was evaporated in vacuo
2. filtrationThe residual solid was filtered off
3. washwashed with water
4. customdried