1. Introduction
It has been several development studies about torquoselectivity during
recent years. This property can be defined as the preference by the
outward or inward of the substitutes in the electrocyclic ring-opening
reactions 1–6. Traditionally, this property has been
aboard into the Woodward-Hoffmann rules using the orbital symmetry7,8. The studies using the Woodward-Hoffmann rules in
electrocyclic reactions establish a relationship between electrocyclic
ring-opening reactions with an electronic reorganization thought
pericyclic process. However, in several reactions it pericyclic
reorganization cannot explain the experimental data in electrocyclic
reactions or reaction yields. Therefore, new points of view beyond
orbital symmetry is necessary 9–16.