Abstract The substituent chemical shifts of a series of para substituted-3-phenyl-as-triazine 4- oxides were studied using the Swain-Lupton F and R values. This data was compared to that obtained for parasubstituted biphenyls, phenyl pyrroles and phenyl furans. It was found that the substituent chemical shifts in the triazines behaved in a similar manner to that in the biphenyl system.
![Furo[3,4-e]-1,2,4-triazine,5,7-dihydro-5,5,7,7-tetramethyl-3-phenyl-, 4-oxide Structure](https://image.chemsrc.com/caspic/366/73083-51-9.png)