Divinylcyclopropane-cycloheptadiene rearrangement
The divinylcyclopropane-cycloheptadiene rearrangement is an organic chemical transformation that involves the isomerization of a 1,2-divinylcyclopropane into a cycloheptadiene or -triene. It is conceptually related to the Cope rearrangement, but has the advantage of a strong thermodynamic driving force due to the release of ring strain.
Source: Wikipedia — Divinylcyclopropane-cycloheptadiene rearrangement (CC BY-SA 4.0)