Table 3. Structural Parameters Associated with Z–E Back-isomerization Kinetics.
| compd | TS type | qN-pyrazole | qN-aryl | N=N Wiberg index | N=N bond (Å) | calcd t1/2 (h) | exptl t1/2 (h) |
|---|---|---|---|---|---|---|---|
| 1e | II | –0.125 | –0.084 | 1.9376 | 1.240 | 1046.5 | 3504 |
| 1i | I | –0.131 | –0.160 | 1.8713 | 1.247 | 38.8 | 12.9 |