Synthesis and Structure Determination of 6-Chloro-1,2,4-triazolo[ 4,3-b ]pyrido[2,3-d] and [3,2-d]pyridazines

Faculty of Science, Assint University (Qena), Egypt

Faculty of Science, Ain Shams University, Egypt

Manuscript received 18 April 1988, accepted 12 October 1988

5,8-Dichloropyrido[2,3-d)pyridazine when treated with hydrazine hydrate gave a mixture of 5-chloro-8-hydrazino- and 8-chloro-5-hydrazinopyrido[2,3-d]pyridazines wbich when allowed to react with formic acid gave 6-chloro-1,2,4-triazolo[4,3-b)pyrido- (2,3-d) and [3,2-d]pyridazines.