What is the Tolerance value?
The Tolerance value makes it possible to have more than one main product in certain cases. Take an aromatic electrophilic substitution reaction as an example, in which the electrophilic localization energy on the aromatic ring is the lowest in the para position, but it is almost as negative in the ortho position. If the difference is less than the tolerance, both ortho and para isomers are generated as main products.
