In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Preparation of magnesium azaphthalocyanines by cyclotetramerization of S-substituted 4,5-disulfanylpyrazine-2,3-dicarbonitriles, published in 1996-12-31, which mentions a compound: 56413-95-7, mainly applied to magnesium azaphthalocyanine preparation cyclization disulfanylpyrazine dicarbonitrile; sulfanylpyrazine dicarbonitrile cyclization magnesium azaphthalocyanine preparation; carbonitrile disulfanylpyrazine cyclization magnesium azaphthalocyanine preparation; substituent cyclization disulfanylpyrazine dicarbonitrile azaphthalocyanine preparation, COA of Formula: C6Cl2N4.
Four novel S-substituted 4,5-disulfanylpyrazine-2,3-dicarbonitriles were obtained in a multistep synthesis from diaminomaleonitrile. Two of these dicarbonitriles, with Et or benzyl S-substituents, give pure Mg azaphthalocyanines in good yields when reacted with Mg propoxide in PrOH and dioxane. Aromatic S-substituents are less stable during the reaction conditions used for cyclizations, and product mixtures were obtained.
If you want to learn more about this compound(5,6-Dichloropyrazine-2,3-dicarbonitrile)COA of Formula: C6Cl2N4, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(56413-95-7).
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