Electronic effects on the photochemical conversion of o-terphenyl to triphenylene were examined by comparing the ultraviolet irraiation reaction, carried out in a benzene solution using iodine as an oxidant, of three classes of o-terphenyl derivatives, 4-(3) and 4′- substituted (4) and 4, 4 ″-disubstituted derivatives (5). While a strong electron-withdrawing group such as nitro group, hindered the cyclization reaction to occur, methoxy, fluoro, ...
![Acetamide,N-(5-bromo[1,1'-biphenyl]-2-yl)- Structure](https://image.chemsrc.com/caspic/166/7147-52-6.png)
