反应详情

A 1.65 g. amount of 3-amino-1-(3,4-dichlorophenyl)-2-pyrazoline (prepared as described in Example 2) is dissolved in 5.0 ml. of concentrated hydrochloric acid then methanol is added and the solvents are evaporated in vacuo. The residue is triturated with ether several times then acetone is added to crystallize the product. The product of the Example is collected by filtration and washed with ether to give 1.65 g. as colorless crystals, m.p. 170°-175° C. (dec.).

1. customthe solvents are evaporated in vacuo
2. customThe residue is triturated with ether several times
3. additionacetone is added
4. customto crystallize the product
5. washwashed with ether
6. customto give 1.65 g