Table 2.

Aromatic hydroxylation of resveratrol derivatives 4a-d with IBX/Na₂S₂O₄ procedure. ^a

Entry	Substrate	Time (h)	Conv. (%)	Yield (%)
1	4b	1	92	5b: 88
2	4c	2	90	5c: 84
3	4d	2	90	5d: 82

^a Oxidation reactions were performed in DMSO at room temperature.