Sulfuric Acid → HCID 12562796, compound

Participants

Reaction Steps

A mixture of 3 g. of 3-chloro-6-(4-cyano-5-amino-1-pyrazolyl)-pyridazine (prepared according to Example 24) and 10.5 ml. of concentrated sulphuric acid is stirred at room temperature for one hour. Then the mixture is poured onto ice, the precipitate filtered, washed with water and triturated with 15 ml. of hot ethanol, filtered and dried. Yield: 3.05 g. (93.5%); m.p.: 314°-317° C.

Provenance & Evidence