Abstract: Electrocyclization reactions of 1,2-divinylbenzene and several related molecules were studied by performing density functional theory (DFT) calculations together with the 6-31+G* basis set. Reactants, products, and transition states for each reaction were localized and the IRC connecting reactants and products was also obtained. Magnetic properties were evaluated along the reaction path to elucidate the characteristics of the reactions studied with respect to their aromaticity and pericyclic character. Though reactions B and C seem to be borderline cases between pericyclic andpseudopericyclic behaviour, the analysis of different magnetic properties allow us to conclude that all reactions studied are pericyclic.