[1]Benzothiéno [2,3-d]pyridazines—VI : Etude des réactions de cyclisation des hydrazinobenzothiénopyridazines

The 1- and 4-hydrazino1]benzothiéno2,3-d]pyridazines have been cyclised to form triazolobenzothienopyridazines, tetrazolobenzothienopyridazines and benzothienopyridazinotriazines. NMR study shows a tautomeric equilibrium in solution between tetrazolo 1,5-b]1]benzothiéno3,2-d] pyridazine and 1- azido 1]benzothieno2,3-d]pyridazine. Reactions of the benzothienopyridazinotriazones with hydrazine were studied.