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.Lee, Bum Hoon; Jaung, Jae Yun; Jeong, Sung Hoon researched the compound: 5,6-Dichloropyrazine-2,3-dicarbonitrile( cas:56413-95-7 ).Category: chiral-oxygen-ligands.They published the article 《Synthesis and dyeing properties of dicyanopyrazine dyes》 about this compound( cas:56413-95-7 ) in Journal of the Korean Fiber Society. Keywords: cyanopyrazine dye preparation use polyamide polyester. We’ll tell you more about this compound (cas:56413-95-7).
Reaction of 2,3-dichloro-5,6-dicyanopyrazine with various Fischer’s base type enamines gave the corresponding 2-chloro-5,6-dicyanopyrazine derivatives The reactive-disperse dyes showed large differences in λmax from solution to solid state resulting from strong intermol. π-π interactions. These dyes have rather small mol. size but have a strong intramol. charge-transfer chromophoric system. The absorption maxima of these compounds were observed at 463∼560 nm. The electronic character of the substituents in the dyes strongly affects their absorption spectra, producing bathochromic shifts depending on both the basicity of the heterocyclic moiety and the enlargement of the π-conjugated system. The dyeability of 2 of the dyes toward polyester and nylon fiber were generally good. Wash, perspiration, and rubbing fastness were excellent, while light fastness was poor, probably due to the oxidation of the enamine moiety.
Compound(56413-95-7)Category: chiral-oxygen-ligands received a lot of attention, and I have introduced some compounds in other articles, similar to this compound(5,6-Dichloropyrazine-2,3-dicarbonitrile), if you are interested, you can check out my other related articles.
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