# Multiplicity of a transition state undergoing a six electron movement

How to specify the multiplicity for the transition state of a molecule undergoing a Cope rearrangement? I've read that one could technically approximate the transition state (TS) as a diradical, but that it's more so delocalized over the six electrons moving. In this case, can you still “average” the unpaired electrons as if they were a diradical?

• If I am not mistaken, for an adiabatic process, the total spin is conserved $\Delta S = 0$. You will have a singlet diradical.
– PAEP
Jul 23 at 4:53