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, 35857-89-7, name is 6-Chloropyridazine-3-carbonitrile, introducing its new discovery. Quality Control of 6-Chloropyridazine-3-carbonitrile
Simple and efficient synthesis of novel N -dichloroacetyl-3,4-dihydro-2 H -1,4-benzoxazines
An easy synthetic route to N -dichloroacetyl- 3,4-dihydro-2 H -1,4-benzoxazine derivatives 3 involves cyclization of 2-aminophenols 1 with 1,2-dibromoethane and subsequent acylation of the resultant 3,4-dihydro- 2 H -1,4-benzoxazine derivatives 2 with dichloroacetyl chloride. All compounds were characterized by IR, 1 H NMR, 13 C NMR, ESI-MS and elemental analysis. The structure of 3a was determined by X-ray crystallographic analysis.
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Reference：
Pyridazine – Wikipedia,
Pyridazine | C4H4N923 – PubChem