NICS evaluation for Cope rearrangements of cis-1,2-divinylcyclopropane and cis-1,2-divinylcyclobutane

Aromaticity of transition structures for Cope rearrangements of cis-1,2-divinylcyclopropane and cis-1,2-divinylcyclobutane is evaluated on the basis of GIAO-HF/6-31 + G*//B3LYP/6-31G* calculated NICS values.