反应详情

3-Amino-1-(p-chlorophenyl)-2-pyrazoline (5 g) was added to acetic anhydride (4.0 ml) at room temperature. On stirring with a glass rod the mixture became warm and afforded a dark red liquid. The mixture was taken up in dichloromethane (100 ml) washed (water, 100 ml; saturated sodium bicarbonate, 100 ml; water, 100 ml), dried over sodium sulphate and the solvent removed in vacuo to afford the title compound (m.p. 171°-173°).

1. temperaturebecame warm
2. customafforded a dark red liquid
3. washwashed (water, 100 ml; saturated sodium bicarbonate, 100 ml; water, 100 ml)
4. dry with materialdried over sodium sulphate
5. customthe solvent removed in vacuo