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Aromatic hydroxylation of 3,5-di-O-acetyl resveratrol (4a) with IBX/Na2S2O4 procedure.
| Entry | Solvent | T (°C) | Time (h) | Conv. (%) | Yield of 5a (%) |
|---|---|---|---|---|---|
| 1 | Methanol | 0 | 1 | 20 | 20 |
| 2 | Methanol/Chloroform=1/1 | 0 | 1 | 70 | 68 |
| 3 | Dimethyl carbonate | 25 | 2 | 50 | 46 |
| 4 | Dimethyl sulfoxide | 25 | 1 | >98 | 95 |
