Scheme 151. Synthesis of Di- and Tetracyanopyrazines.
Reagents and conditions: (a)291 2,3-diaminomaleonitrile, EtOH/AcOH (1:1), 80 °C, 11–16 h; (b) 4,5-diaminophthalonitrile, EtOH/AcOH (1:1), 80 °C, 11–16 h.
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