Table 12.
Free radical quenching experiments in cyclohexane oxidation utilizing O2 catalyzed by Si@Porp. Co&Cu a.
| Entry | Quenching Reagents |
Conversion (%) |
Selectivity (%) | |||||
|---|---|---|---|---|---|---|---|---|
| C6-OOH | C6-OH | C6=O | C4-(COOH)2 | C3-(COOH)2 | Total b | |||
| 1 | / | 5.27 | 15.8 | 41.9 | 34.6 | 6.2 | 1.5 | 92.3 |
| 2 | CBrCl3 | 1.25 | 94.8 | N. D. c | 5.2 | N. D. | N. D. | >99 |
| 3 | t-BuBr | 1.08 | 38.7 | N. D. | 61.3 | N. D. | N. D. | >99 |
| 4 | Ph2NH | 0.17 | 29.7 | 30.3 | 40.0 | N. D. | N. D. | >99 |
a Reaction conditions: substrate (cyclohexane, 16.8320 g, 200 mmol), O2 (1.0 MPa in constant supply), catalyst (Si@Porp. Co&Cu, 32 mg, 0.16 mg/mmol), quenching reagent (10.0 mmol, 5%, mol/mol), stirring at 600 rpm and 120 °C for 8.0 h. b Total selectivity of POX-products. c Not detected.