The synthesis of novel polycyclic heterocyclic ring system via photocyclization. 18 . Benzo[ h ]naphtho‐[1′,2′:4,5]thieno[2,3‐ c ]quinoline and benzo[ h ]naphtho‐[1′,2′:4,5]thieno[2,3‐ c ] [1,2,4]triazolo[4,3‐ a ]quinoline

The synthesis of two previously unknown polycyclic ring systems, benzo[ h ]naphtho[1′2′:4,5]‐thieno[2,3‐ c ]quinoline ( 1 ) and benzo[ h ]naphtho[1′,2′:4,5]thieno[2,3‐ c ][1,2,4]triazolo[4,3‐a]quinoline ( 2 ), was achieved via oxidative photocyclization of 1‐chloro‐ N ‐(1‐naphthyl)naphtho[2,1‐ b ]thiophene‐2‐carboxamide ( 5 ). The total assignment of their 1 H and 13 C nmr spectra was determined by the concerted use of two‐dimensional nmr methods.