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2,3-dichloropyrazine (1000 g, 6.7 mol) and hydrazine monohydrate (700 g, 14 mol) were dissolved in absolute ethanol (2 L) and refluxed under N2 overnight. A crystalline precipitate formed, which was collected by filtration, washed with ethanol (1 L), and dried to afford the desired produced as a yellow solid (880 g, 90% yield).

1. temperaturerefluxed under N2 overnight
2. customA crystalline precipitate formed
3. filtrationwhich was collected by filtration
4. washwashed with ethanol (1 L)
5. customdried
6. customto afford the