So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Kopecky, Kamil; Zimcik, Petr; Novakova, Veronika; Miletin, Miroslav; Musil, Zbynek; Stribna, Jana researched the compound: 5,6-Dichloropyrazine-2,3-dicarbonitrile( cas:56413-95-7 ).Quality Control of 5,6-Dichloropyrazine-2,3-dicarbonitrile.They published the article 《The synthesis and characterization of metal-free, unsymmetrical azaphthalocyanines with hydroxy groups and their complex formation with pyridine》 about this compound( cas:56413-95-7 ) in Dyes and Pigments. Keywords: azaphthalocyanine pyridine complex preparation dye. We’ll tell you more about this compound (cas:56413-95-7).
Three, unsym. metal-free azaphthalocyanines (AzaPc) were prepared using the statistical condensation of 5,6-bis(diethylamino)-pyrazine-2,3-dicarbonitrile (A) and the pyrazinedicarbonitrile (B) substituted with alkylamine chains bearing one or two hydroxy groups. The desired AAAB type, metal-free compounds were isolated, purified and characterized; the compounds contain one or two hydroxy groups that can be modified with suitable ligands. The mechanism leading to the unusual formation of a new morpholine ring during the preparation of some pyrazinedicarbonitriles is explained. Metal-free AzaPcs form a proton-transfer complex with two mols. of pyridine, this complex formation being accompanied by a change of solution color from purple to blue. The complex is formed directly with two mols. of pyridine, one on either side of the macrocycle. The rate constants of this process were found to be of the order ∼10-4 s-1; the rate of complex formation was not the same for all compounds and may depend on the AzaPc structure. The influence of hydroxy groups on the rate constant was not confirmed.
After consulting a lot of data, we found that this compound(56413-95-7)Quality Control of 5,6-Dichloropyrazine-2,3-dicarbonitrile can be used in many types of reactions. And in most cases, this compound has more advantages.
Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate