All the population in CHD undergoing internal conversion through the OOP-CIs returns to the original ground state minimum. The same is true for the majority of the population accessing the OOP-CIs in αPh. However, a minor fraction of the population yields 2-ladderane (5-isopropyl-2-methylbicyclo[2.2.0]hex-2-ene) as a ground state reaction product, resulting from an electrocyclic ring-closure reaction of the diene π-system of αPh. The stereochemistry of this reaction is compatible with a disrotatory ring-closure, and in agreement with the Woodward-Hoffmann rules. Thus, the OOP-CIs can be tentatively associated with the electrocyclic ringclosing reaction in CHD-like molecules. However, the trajectories indicate that the ring-closure behavior differs from the ring-opening reaction. The ring-closure does not happen immediately following internal conversion as the ring-opening. In some cases, ring-closure follows extended evolution on the ground state surface.