| substituents |
Activation energies, ΔEact (kcal/mol) |
Enthalpy changes, ΔH (kcal/mol) |
| |
Para-endo |
Para-exo |
Meta-endo |
Meta-exo |
Para-endo |
Para-exo |
Meta-endo |
Meta-exo |
| -CH3 |
+7.63 |
+10.07 |
+11.20 |
+12.18 |
-55.18 |
-52.62 |
-54.00 |
-52.84 |
| -OH |
+3.97 |
+11.06 |
+17.11 |
+16.21 |
-54.45 |
-52.11 |
-49.93 |
-50.08 |
| -CN |
+3.27 |
+5.06 |
+4.50 |
+5.02 |
-57.85 |
-57.85 |
-57.94 |
-57.94 |
| -Cl |
+5.30 |
+8.78 |
+11.25 |
+11.50 |
-58.48 |
-58.48 |
-58.08 |
-58.08 |
|
