Figure 9.
Endo and Exo TSs of the 1d and 1e+A2 Cycloadditions. Gas-phase enthalpies of activation computed at the B3LYP/6−31G(d) level. Free energies of activation computed by B3LYP/6−31G(d), corrected for solvent effects by PCM single-points at HF/6−31+G(d,p). Interatomic distances around the forming ring in Å and angles of pyramidalization at the termini of the partially formed bonds are labeled.