Splitting the (near-)degenerate transitions may enhance the ECD response because transitions with opposite rotatory strengths move towards different wavelengths. As as showed for allene, this can be achieved by axial torsion of the molecule, which in particular affects the eigenvalues of the helical MOs. However, as plotted in Figure , torsion also affects the rotatory strengths, which weaken with torsion for many of the transitions. Figure also includes an assessment of a series of hypothetical conformationally-locked cyclic spiropentadienes. Their torsion angles are constrained by the alkyl linkers, and their electronic transitions show reasonable correlation with the constrained nonlinked systems for most of the transitions (ESI Figure ). With the reduction of the rotatory strength, it seems that splitting the near-degenerate electronic transitions has limited potential for enhancing the chiroptical response of spiropentadiene derivates.