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In 2.5 moles of 2,3-dicyanonaphthalene, 0.075 mole of sodium methoxide and 1 liter of methanol, an ammonia gas was flowed with a suitable flow rate for 40 minutes. Then, the reaction solution was refluxed with heating while flowing the ammonia gas for 4 hours. After cooling, the product was filtered, and recrystallized from a mixed solvent of methanol/ether to yield yellow 1,3-diiminobenz(f)isoindoline in 66% yield.

1. temperatureThen, the reaction solution was refluxed
2. temperaturewith heating
3. customfor 4 hours
4. temperatureAfter cooling
5. filtrationthe product was filtered
6. customrecrystallized from a mixed solvent of methanol/ether