Abstract: Cyclopentenyl and cyclohexenyl cations have been observed in equilibrium with one another. The kinetics of the approach to equilibrium and the equilibrium constants have been measured in eleven different acid solvents for four series of these ions. An attempt is made to rationalize the marked stability of cyclopentenyl cations compared to the cyclohexenyl analogs. eno and coworkers2a first observed the rearrange-D ment of ...
