Further studies on heterocyclic arene imines. Preparation of 1a,9b‐dihydroazirino[f][1,7]phenanthroline, 3b,4a‐dihydroazirino‐[2,3]phenaleno[1,9‐g,h]quinoline and 1a,13b‐dihydrodibenzo[1,2:6,7]phenazino[1,2‐b]azirine