A versatile access to pyridazines with tethered imidazolium groups—new precursors for mono- and binucleating NHC/pyridazine hybrid ligands

One or two imidazolium groups have been attached to the 3- and 6-positions of the pyridazine heterocycle, providing valuable precursors for mono- and binucleating NHC/pyridazine hybrid ligands. For N-methyl imidazole with specific backbone substituents an unexpected methyl group transfer is observed, which defines the scope of the synthetic procedure. H-Bonding patterns in the solid state are elucidated by X-ray crystallography for seven chloride or PF 6 - salts of the new compounds.