Scheme 8.

Calculated Gibbs free energies (in kcal mol−1) for the AlMe3‐catalyzed cycloaddition between 7 and 8 (above) and structure as well as selected bond lengths (in Å) for the transition states TS3 (below).

Calculated Gibbs free energies (in kcal mol−1) for the AlMe3‐catalyzed cycloaddition between 7 and 8 (above) and structure as well as selected bond lengths (in Å) for the transition states TS3 (below).