In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Preparation of octa(alkoxy) azaphthalocyanines, published in 1999-12-31, which mentions a compound: 56413-95-7, Name is 5,6-Dichloropyrazine-2,3-dicarbonitrile, Molecular C6Cl2N4, Category: chiral-oxygen-ligands.
5,6-Bis(alkoxy)pyrazine-2,3-dicarbonitriles with methoxy-, ethoxy-, and propoxy-substituents were allowed to react with magnesium alkoxides to form the corresponding magnesium octaalkoxyazaphthalocyanines. The methoxy compound (I) was converted into the metal-free azaphthalocyanine and to the copper complex. The propoxy-substituted magnesium azaphthalocyanine was also converted to the metal-free azaphthalocyanine. Both of the propoxy compounds were readily soluble in organic solvents. The stable intermediate Me 2,3-dimethoxy-6-cyanopyrazine-5-carboximidate (II) was obtained both from reaction of 5,6-dichloropyrazine-2,3-dicarbonitrile with sodium methoxide in methanol, and in a sodium methoxide-catalyzed reaction of 5,6-dimethoxypyrazine-2,3-dicarbonitrile (III) with ammonia in methanol. II was converted into I with magnesium methoxide, and was therefore an intermediate between III and I.
This literature about this compound(56413-95-7)Category: chiral-oxygen-ligandshas given us a lot of inspiration, and I hope that the research on this compound(5,6-Dichloropyrazine-2,3-dicarbonitrile) can be further advanced. Maybe we can get more compounds in a similar way.
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