Ten‐π ‐ electron nitrogen heterocyclic compounds. VIII. Semi‐empirical calculations of chemical‐shifts of ring‐protons and of methyl‐protons

The chemical‐shifts of the ring protons and of the methyl protons of some unsub‐stituted and some methylpolyazanidenes have been calculated by a semi‐empirical method utilizing charge‐densities obtained from HMO calculations. The success of this method lies in the choice of the reference compound, pyrrocoline.