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15.0 g (91.1 mmol) of 2-chloroquinoxaline are initially charged in 150 ml of ethanol. 45.6 g (911.3 mmol) of hydrazine hydrate are added, and the mixture is stirred under reflux for 16 h. The mixture is then cooled to 0° C., and the solid formed is filtered off, washed with ethanol and dried under high vacuum.

1. temperatureunder reflux for 16 h
2. customthe solid formed
3. filtrationis filtered off
4. washwashed with ethanol
5. customdried under high vacuum