Cl[C:2]1[N:7]=[N:6][C:5]([C:8]2[N:9]=[N:10][C:11](Cl)=[CH:12][CH:13]=2)=[CH:4][CH:3]=1.C([Sn](CCCC)(CCCC)[C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][N:21]=1)CCC>>[N:21]1[CH:22]=[CH:23][CH:24]=[CH:25][C:20]=1[C:2]1[N:7]=[N:6][C:5]([C:8]2[N:9]=[N:10][C:11]([C:22]3[CH:23]=[CH:24][CH:25]=[CH:20][N:21]=3)=[CH:12][CH:13]=2)=[CH:4][CH:3]=1Specifically, it was envisioned, firstly, to use the 6,6′-dichloro-3,3′-bipyridazine dimer 17, which, when subjected to Stille heterocoupling in the presence of two equivalents of 2-tributylstannylpyridine 18, should produce the expected 6,6′-bis(pyridin-2-yl)-3,3′-bipyridazine 19.
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