SCHEDULED MAINTENANCE:
Hydrazonoyl halides upon reaction with N-methylimidazole and N-substituted benzimidazoles yield ring opened 1 : 1 adducts. The action of aqueous sodium hydroxide on these adducts leads to the formation of pyrazin-2-one or quinoxalin-2-one derivatives via ring expansion.
P. D. Croce, M. Ioannisci and E. Licandro, J. Chem. Soc., Perkin Trans. 1, 1979, 330 DOI: 10.1039/P19790000330
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