A Carbon‐13 and nitrogen‐15 NMR study of some nitrogen heterocycles

Abstract

AbstractA number of phenyl‐substituted nitrogen heterocycles and the corresponding 2,6‐diethylphenyl derivatives were examined by 13C nmr in order to verify that the heterocyclic ring system was the same in both series. The heterocyclic ring carbon shifts did not differ substantially between the phenyl and 2,6‐diethylphenyl derivatives for all systems except one, where substantial differences were also seen in the 15N chemical shifts. Acetylated derivatives were prepared to confirm the cyclization mode in this latter case.