In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 66346-87-0, name is 6-Chloro-5-methylpyridazin-3-amine, introducing its new discovery. Quality Control of 6-Chloro-5-methylpyridazin-3-amine
The synthesis of 2-substitutedimidazo[1,2-b]pyridazines and their reactivity towards electrophilic substitutions are reported. The nitration was shown to be very dependent on the nature of the 2 substituent. Nitrosation using sodium nitrite in acetic acid media as a general method failed in all cases whereas chlorination was observed in warm hydrochloric acid. In order to ascertain the structure of some chloro derivatives, chlorination using N-chlorosuccinimide was also reported. Depending of the nature of the substituent, the reaction occurred at the C-3 imidazolic position and/or at the substituent on position 2. The 3-nitroso-2-phenyl derivative was finally obtained using an alternative synthetic pathway by direct condensation of 3-amino-6-chloropyridazine to omega-chloro-omega-nitrosoacetophenone. The structural determinations were ascertained using high field 1H and 13C-NMR.
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Reference：
Pyridazine – Wikipedia,
Pyridazine | C4H4N1099 – PubChem