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Beilstein J. Org. Chem. 2013, 9, 1463–1471, doi:10.3762/bjoc.9.166
Graphical Abstract
Scheme 1: Syntheses of 1-arylpyridazinium salts.
Scheme 2: Suggested transformation of the cyclic enaminones into the corresponding bicyclic pyridazinium salt...
Scheme 3: The synthesis of the starting β-enaminones.
Scheme 4: Synthesis of the bicyclic pyridazinium salts using different methods.
Scheme 5: Possible mechanism of the formation of the pyridazinium salts 5.
Scheme 6: An attempt at synthesis of 5n and possible explanation of the failure.
Figure 1: ORTEP view of the cation of compound 5f showing the thermal ellipsoids at 30% probability level. Bo...
Figure 2: ORTEP view of the cation of compound 5l showing the thermal ellipsoids at 30% probability level. Bo...