Diazanaphthalenes are a class of aromatic heterocyclic chemical compounds that have the formula C8H6N2. They consist of a naphthalene double ring in which two of the carbon atoms have been replaced with nitrogen atoms. There are ten positional isomers, which differ by the locations of the nitrogen atoms.
The group consist of two subgroups: four benzodiazines with both N atoms in one ring: cinnoline, quinazoline, quinoxaline, and phthalazine six naphthyridines with one N atom in each ringDesmond J. Brown, Jonathan A. Ellman, Edward C. Taylor: The Chemistry of Heterocyclic Compounds, The Naphthyridines, John Wiley & Sons, 2007.
Isomers Names Structure Subgroup CAS RN 1,2-diazanaphthalene(cinnoline) benzodiazine 253-66-7 2,3-diazanaphthalene(phthalazine) benzodiazine 253-52-1 1,3-diazanaphthalene(quinazoline) benzodiazine 253-82-7 1,4-diazanaphthalene(quinoxaline) benzodiazine 91-19-0 1,7-naphthyridine naphthyridine 253-69-0 1,8-Naphthyridine naphthyridine 254-60-4 2,7-naphthyridine naphthyridine 253-45-2 1,6-naphthyridine naphthyridine 253-72-5 1,5-naphthyridine naphthyridine 254-79-5 2,6-naphthyridine naphthyridine 253-50-9
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