Syntheses and properties of new styryl dyes derived from 2,3-dicyano-5-methylpyrazines

NIR Dyes for Information Recording, from Origin to Update

“…2,3-Dichloro-5,6-dicyanopyrazine 30 is the valuable intermediate to synthesize wide varieties of pyrazine derivatives [29][30][31]. Diaminomaleonitrile 31 is well known raw material to synthesize 2,3-disubstituted-5,6-dicyanopyrazines 32 and related dyes [32].…”

Synthesis and spectral properties of tetraquinoxalino-porphyrazines containing benzocrown-ether group

“…Recently, highly functionalized 2,3-dicyanoquinoxalines have become important for a broad range of chemical applications including dyestuffs and electroluminescence materials [2][3][4].…”

Synthesis and structures of azine-based crown-containing hetarylphenylethenes

“…2 It is ex pected that such ligands and supramolecular assemblies based on these ligands can be used for molecular recogni tion of chiral molecules 3,4 and the design of molecular devices having good luminescence characteristics 5, 6 and materials for optoelectronics 7, 8 and find application in electrochemical analysis as well. 9 Hetarylphenylethenes based on pyridine, quinoline, dipyridyl, 3H indole, benzothiazole, and benzoxazole can be prepared by condensation of methyl substituted het erocyclic bases with substituted benzaldehydes under ba sic (Py, 10,11 piperidine, 12 Bu t OK, 13 AlkONa (Alk = Me or Et), 14,15 or LDA 16 ) or acidic (ZnCl 2 , 17, 18 HCl, 19 ace tic acid, or acetic anhydride 20,21 ) conditions. The synthe sis of hetarylphenylethenes by the Wittig reaction was also documented.…”