Abstract: The ring current model is often used to interpret the chemical shifts of alkene containing proton and carbon nuclei. However, theoretical interpretation using these models leads to notable inconsistencies with the experimental data. In this paper, the pitfalls of using the p-electron circulation model are discussed. It is also shown that the model of deformation and variation of density of electron clouds around nuclei is a better model for interpreting the chemical shifts of alkene.

Key words: NMR, chemical shift, electron cloud, alkene, ring current model