Condensation of 5, 6-diamino-4, 7-phenanthroline with glyoxal provides 1, 4, 5, 12- tetraazatriphenylene in quantitative yield. This procedure avoids the 50% loss of product inherent in previous methods. Derivatives were also prepared by using α-dicarbonyl compounds other than glyoxal. Additional derivatives were prepared from 1, 4, 5, 12- tetraazatriphenylene-2, 3-dicarbonitrile, produced by condensation of diaminomaleonitrile ...
