Quinoxalin-2(1H)-one undergoes ring fission on treatment with boiling 50% aqueous hydrazine to give a mixture of 2-methylbenzimidazole and o-phenylenediamine. Quinoxaline-2,3-(1H,4H)-dione and its 1-methyl derivative are converted into 3-hydrazinoquinoxalin-2(1H)-ones on similar treatment.
G. W. H. Cheeseman and M. Rafiq, J. Chem. Soc. C, 1971, 452 DOI: 10.1039/J39710000452
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