On November 21, 1995, Ellis, Michael J.; Lloyd, Douglas; McNab, Hamish; Walker, Marion J. published an article.Formula: C8H10N2 The title of the article was Gas-phase pyrolysis of 2,3-dihydro-1,4-diazepines: involvement of the saturated portion of the ring in chemical reactions and novel cis-trans isomerization of a fused ring system. And the article contained the following:
Flash vacuum pyrolysis of 2,3-dihydro-1,4-diazepines in the range 450-550 °C involves interaction of the saturated portion of the mol. with the vinamidine system and causes 1,5-hydrogen shifts which have been established by deuterium labeling experiments; at higher temperatures, ring contraction occurs to give pyrazines as major products. The experimental process involved the reaction of 5,6,7,8-Tetrahydroquinoxaline(cas: 34413-35-9).Formula: C8H10N2
The Article related to isomerization pyrolysis dihydrodiazepine, ring contraction pyrolysis dihydrodiazepine, hydrogen shift pyrolysis dihydrodiazepine, mechanism pyrolysis dihydrodiazepine, Physical Organic Chemistry: Degradation Reactions, Including Mass Spectral Fragmentation and other aspects.Formula: C8H10N2
Referemce:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider