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Optimization studies for photocatalytic hydroxamic acid synthesis
| ||||
|---|---|---|---|---|
| entry | reductant | acid (equiv) | yield 2 (%)a | yield 3 (%)a |
| 1 | i-Pr2NEt | HCO2H (1) | <5 | 0 |
| 2 | 4 | HCO2H (1) | 0 | <5 |
| 3 | 5 | HCO2H (1) | 50 | 20 |
| 4 | 5 | none | 71 | 0 |
| 5 | 5 | AcOH (1) | 52 | 25 |
| 6 | 5 | TFA (1) | 0 | 84 |
| 7 | 5 | CSA (1) | 0 | 89 |
| 8 | 5 | CSA (0.1) | 0 | 88 |
| 9b | 5 | CSA (0.1) | 0 | <5 |
| 10c | 5 | CSA (0.1) | 0 | 0 |
Yield determined by 1H NMR analysis.
Reaction conducted in the absence of Ru(bpy)3Cl2.
Reaction conducted in the dark.
