The synthesis of novel polycyclic heterocyclic ring systems via photocyclization. 19 . Thieno3′,2′:4,5thieno2,3‐ c ‐naphtho1,2‐ f quinoline, thieno3′,2′:4,5thieno2,3‐ c naphtho‐1,2‐ f 1,2,4triazolo4,3‐ a quinoline and thieno3′,2′:4,5‐thieno2,3‐cnaphtho1,2‐ f tetrazolo1,5‐ a quinoline