J. A. Hugh MacBride
J. Chem. Soc., Chem. Commun., 1974, 359b-360
DOI:
10.1039/C3974000359B,
Paper
2,7,9,10-Tetra-azaphenanthrene has been obtained by reduction of 3,3′-dinitro-4,4′-bipyridyl and gives 2,7-diazabiphenylene upon vacuum pyrolysis.