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quinoxalinedione : ウィキペディア英語版
quinoxalinedione

Quinoxalinedione is an organic compound with the formula C6H4(NH)2(CO)2. It is a colorless solid that is soluble in polar organic solvents. Quinoxalinediones are a family of related compounds sharing the same bicyclic core. Various quinoxalinediones are drugs.
==Synthesis and structure==
Quinoxalinedione is produced by condensatoin of dimethyloxalate and o-phenylenediamine:
:C2O2(OMe)2 + C6H4(NH2)2 → C6H4(NH)2(CO)2 + 2 MeOH
The compound exists in solution and the solid state predominantly as the diamide form.〔Saied M. Soliman, Jörg Albering, Morsy A.M. Abu-Youssef "Low temperature X-ray molecular structure, tautomerism and spectral properties of 2,3-dihydroxyquinoxaline" Journal of Molecular Structure 2013, vol. 1053, pp. 48–60. 〕 Some reactions of the compound indicate a role for the diol tautomer.

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