Photocyclization of 2‐(naphth‐1‐yl)‐3‐(thien‐2‐yl)propenoic acid and the total assignment of the ¹H‐ and ¹³C‐NMR spectra of the product

Abstract

Abstract Photocyclization of the substituted 2‐(naphth‐1‐yl)‐3‐(thien‐2‐yl)propenoic acid ( 3 ) in the presence of iodine and air in a benzene‐cyclohexane mixture afforded a separable mixture of three compounds, phenanthro[2,1‐ b ]thiophene‐10‐carboxylic acid ( 4 ), phenanthro[2,1‐ b ]thiothene ( 5 ), and naphtho[1,8‐ cde ]‐thieno[3,2‐ g ][2]benzopyran ( 6 )