The rate of O–O heterolysis and the corresponding activation parametersa.
| Catalyst | k heterolysis (s−1) | Temperature | ΔG≠ (kcal mol−1) | Ref. |
|---|---|---|---|---|
| 6a | 16.6 × 10−3 | −80 °C | 12.78 | 41 |
| 6b | 4 × 10−3 | −80 °C | 13.33 | 41 |
| 6d | 3.94 × 10−3 | −40 °C | 16.19 | 41 |
| 6e | 0.5 × 10−4 | −80 °C | 14.14 | 41 |
| FeIIITMP | (6.5 ± 1) × 10−3 | −40 °C | 15.96 ± 0.1 | 45 |
| FeIII(HPX-CO2H) | (6 ± 3) × 10−3 | −40 °C | 15.99 ± 0.2 | 45 |
| FeIII(HPX-CO2Me) | (1 ± 0.2) × 10−2 | −40 °C | 15.76 ± 0.1 | 45 |
| FeIIIL2 | 21.67 ± 1 | −30 °C | 12.72 ± 0.02 | This work |
| FeIIIL3 | 69.6 ± 2 | −30 °C | 12.15 ± 0.01 | This work |
| FeIIIMPh | (8.5 ± 1) × 10−2 | −30 °C | 15.08 ± 0.05 | This work |
| HRP | 200–500 s−1 | 25 °C | 13–14 | 53 and 70 |
| H42A/H42V | (5–50) × 10−4 | 25 °C | 21 ± 1 | 71 and 73 |
a
The molecular structures (6a, 6b, 6d and 6e) corresponding to ref. 41 are given in Fig. 6. Here, meta-chloroperbenzoic acid is used as an oxidant for all the catalysts except for ref. 53, 71 and 73 (where hydrogen peroxide is the oxidant).