6-Chloro-1,2,4-triazolopyrido- and pyridazines - Synthesis and Structure determination

Article abstract of DOI:10.1002/ardp.19883211223

5,8-Dichloropyrido<2,3-d>pyridazine (2) gave with hydrazine hydrate in dioxane 5-chloro-8-hydrazino- and 8-chloro-5-hydrazinopyrido<2,3-d>pyridazines 3 and 4.When 3 and 4 were allowed to react with formic acid they gave a mixture of the 6-chloro-1,2,4-triazolo<4,3-b>pyrido<2,3-d>- and <3,2-d>pyridazines (5 and 6).