The synthesis of novel polycyclic heterocyclic ring systems via photocyclization. 7. [1]Benzothieno[2,3‐c]naphtho[2,1‐h]quinoline and [1]benzothieno[2,3‐c]naphtho[2,1‐h][1,2,4]triazolo[4,3‐a]quinoline

The synthesis of two novel polycyclic heterocyclic ring systems via photocyclization is described. These are [1]benzothieno[2,3‐c]naphtho[2,1‐h]quinoline and [1]benzothieno[2,3‐c]naphtho[2,1‐h][1,2,4]triazolo[4,3‐α]‐quinoline. In the ¹H nmr spectrum the proton at position 6 is strongly deshielded in the first ring system while the proton at position 6 in the second ring system is shifted considerably upfield while the proton at position 8 in the second ring system is the most deshielded proton in that ring system. The bay regions in both ring systems are severely congested.