A number of polycyclic aromatic thiones have been prepared from the corresponding ketones. Several of the thiones in which there is a free peri position cyclize, on excitation in the π*← n band, to give thiophene derivatives. The structures of these were proven by application of physical methods and by desulfurization to the corresponding benzyl derivatives. The formal hydrogen 1, 3 migration involved was, in one case, shown to be ...
![2-Phenyl-2H-peryleno[1,12 bc]thiophen结构式](https://image.chemsrc.com/caspic/103/40812-84-8.png)
