[CH3:1][O:2][C:3]1[CH:8]=[C:7]([O:9][CH3:10])[CH:6]=[C:5]([O:11][CH3:12])[CH:4]=1.[I:13](O)(=O)=O.II>C(O)C>[I:13][C:4]1[C:5]([O:11][CH3:12])=[CH:6][C:7]([O:9][CH3:10])=[CH:8][C:3]=1[O:2][CH3:1]1,3,5-Trimethoxybenzene (14.5 g, 0.086 mol) was dissolved in 10 mL of ethanol at rt before warming to 50° C. in a waterbath after which, an aqueous solution of iodic acid (7.6 g, 0.043 mol) was added. Solid iodine (21.88 g, 0.086 mol) was dissolved in 20 mL of ethanol and the resultant solution was added portion-wise over 60 min to the reaction mixture. Stirring was continued at 50° C. until the color of I faded and a white precipitate appeared. The reaction mixture2 was stirred at room temperature for 18 h. The precipitate that formed was isolated via vacuum filtration, washed with ethanol and crystallized from methanol to yield 6 (21.7 g, 86%) as white crystals.
Wird geladen…
