Electron charges of bonds and spectroscopic characteristics of organic compounds

On the basis of the fact that the electronic shielding of the protons should be related to the value of the electronic charge at the corresponding C-H bond, the chemical shifts in the PMR spectra were compared with the electronic charges of the σ-bonds of CH in alkanes and cycloalkanes. In this case, the variation of the chemical shifts in structurally different bonds of saturated hydrocarbons and the unusual chemical shift of the protons of cyclopropane were explained.