Figure 5.

Plausible mechanism for the formation of cyclopenten‐4‐yl cation 3 a by reaction of 2 a with AlBr3. Relative Gibbs free energies G are given in kcal mol−1.

Plausible mechanism for the formation of cyclopenten‐4‐yl cation 3 a by reaction of 2 a with AlBr3. Relative Gibbs free energies G are given in kcal mol−1.