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A 10 g. portion of 2-chloro-3-hydrazinoquinoxaline was added to 200 ml. of triethylorthoformate and the mixture was rapidly heated to reflux temperature. After 1 hour of heating, with constant stirring, the reaction mixture was cooled and 10.6 g. of product was collected by filtration. The product was identified as 4-chloro-s-triazolo[ 4,3-a]-quinoxaline, m.p. 285°-86° C., by nuclear magnetic resonance analysis and by elemental microanalysis, the results of which follow.

1. temperatureto reflux temperature
2. temperatureAfter 1 hour of heating, with constant stirring
3. temperaturethe reaction mixture was cooled
4. filtrationof product was collected by filtration
5. customthe results of which