Abstract The O-alkyl N-(3-chloro-2-benzo [b] thienocarbonyl) monothiocarbamates prepared by the reaction of 2-isothiocyanatocarbonyl-3-chlorobenzo [b] thiophene with methanol, ethanol, 1-propanol, and 2-propanol are cyclized on irradiation with light of the wavelength above 300 nm to give high yields (80-90%) of 2-alkoxy-4H-benzo [b] thieno [2, 3-e]-1, 3- thiazin-4-one derivatives. From the absorption and emission spectra of the starting ...
![N-benzyl-3-chlorobenzo[b]thiophene-2-carboxamide Structure](https://image.chemsrc.com/caspic/121/62524-16-7.png)