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The title compound, C 12 H 9 ClN 4 , was prepared from dichloro­pyridazine and tolyl­tetra­zole in a nucleophilic biaryl coupling followed by thermal ring transformation. The mol­ecule is essentially planar (r.m.s. deviation for all non-H atoms = 0.036 Å) and an intra­molecular C—H⋯N hydrogen bond occurs. In the crystal, the mol­ecules form dimers connected  via  π–π inter­actions [centroid–centroid distance = 3.699 (2) Å], which are further connected to neighbouring mol­ecules  via  C—H—N bonds. The bond lengths in the pyridazine ring system indicate a strong localization of the double bonds and there is a weak C—Cl bond [1.732 (3) Å].

6-Chloro-3-(3-methylphenyl)-1,2,4-triazolo[4,3-b]pyridazine