Table 3. QM/MM relative energies (in kcal mol−1) at the TPSS-D3 and B3LYP-D3 levels (both with the def2-TZVPD basis set) of the intermediates in the TIM isomerization reaction in the classical, criss-cross and shuffle mechanisms.
| Criss-cross | Classical | Shuffle | ||||
|---|---|---|---|---|---|---|
| TPSSS | B3LYP | TPSS | B3LYP | TPSS | B3LYP | |
| DHAP | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| TS1 | 9.7 | 6.4 | 9.7 | 6.4 | 9.7 | 6.4 |
| Enediolate 1 | 9.4 | 5.4 | 9.4 | 5.4 | 9.4 | 5.4 |
| TS2 | 15.2 | 13.3 | 17.1 | 13.6 | — | — |
| Enediol | 8.6 | 4.6 | 16.4 | 12.4 | — | — |
| TS3 | 15.2 | 14.6 | 16.9 | 13.9 | 17.5 | 13.5 |
| Enediolate 2 | 9.2 | 6.0 | 8.5 | 4.5 | 8.5 | 4.5 |
| TS4 | 10.3 | 10.4 | 10.3 | 10.4 | 10.3 | 10.4 |
| GAP | 2.4 | 1.6 | 2.4 | 1.6 | 2.4 | 1.6 |