Article révisé par les pairs
Résumé : The 1H and 13C NMR spectra of 1,4‐diazaphenanthrene (benzol f quinoxaline) (1) and some of its derivatives have been fully assigned and most of the coupling constants have been measured. The compounds examined bear a piperidino or methoxy group at the 2‐ or 3‐position, or a chlorine atom at the 2‐, 3‐ or 9‐position. The spectra of the N‐1‐oxides of 1 and of 1,4,5,8‐tetraazaphenanthrene are also given. The syntheses are described. Copyright © 1987 John Wiley & Sons Ltd.