The synthesis of novel polycyclic heterocyclic ring systems via photocyclization. 2 . Benzo[h][1]benzothieno[2,3-c]quinoline and benzo[h][1]benzothieno[2,3-c]quinoline

The synthesis of two previously unknown unsubstituted heterocyclic ring systems namely, benzoh]1]benzothieno2,3-c]quinoline ( 6 ) and benzof]1]benzothieno2,3-c]quinoline ( 12 ) is reported. These two novel ring systems have been assembled by photocyclization of the appropriate amides.