Formic Acid → HCID 21455954, compound

Participants

Reaction Steps

5.8 g. 3-(5-nitro-1-methyl-2-imidazolyl)-6-carbethoxy-s-triazolo[4,3-b]pyridazine were heated under reflux with 18.3 ml. 90 percent aqueous formic acid and 2.75 ml. methane-sulfonic acid for 3 hours at a bath temperature of 130° C. 80 ml. water were then added thereto and the precipitated crystals were filtered off with suction, after having stood for 1 hour, and washed with water. There were thus obtained 4.85 g. 3-(5-nitro-1-methyl-2-imidazolyl)-6-carboxy-s-triazolo[4,3-b]pyridazine, which has a melting point of 257° - 260° C. 1 g. of the product was recrystallized from 15 ml. dioxan with the addition of charcoal, to give 0.6 g. of pure product which melts, with foaming up, at 260° - 262° C.

Provenance & Evidence