反应详情

To a solution of 2.6 g of 1-methyl-4-(3',5'-dichlorophenyl) urazole, which had been prepared by reacting 4-(3',5'-dichlorophenyl) urazole and methyl bromide in an equimolar proportion, and 1.0 g of triethylamine in 10 ml of N,N-dimethylformamide was added 0.8 g of acetyl chloride in small increments at room temperature with agitation. After completing the addition, the reaction was carried out on a water bath for 2 hours with continued agitation. The solvent was removed by distillation into vacuo and the mass was poured in water to precipitate crystals which were recrystallized from ethanol to obtain 2.3 g of 1-methyl-2-acetyl-4-(3',5'-dichlorophenyl) urazole in a yield of 76%.

1. additionthe addition
2. customThe solvent was removed by distillation into vacuo
3. additionthe mass was poured in water
4. customto precipitate crystals which
5. customwere recrystallized from ethanol