C(=O)([O-])[O-].[K+].[K+].Cl[CH2:8][C:9]1[CH:14]=[CH:13][C:12]([O:15][CH3:16])=[CH:11][CH:10]=1.[OH:17][C:18]1[CH:25]=[CH:24][C:21]([CH:22]=[O:23])=[CH:20][C:19]=1[O:26][CH3:27]>CC(C)=O.CCCCCCC>[CH3:27][O:26][C:19]1[CH:20]=[C:21]([CH:24]=[CH:25][C:18]=1[O:17][CH2:8][C:9]1[CH:14]=[CH:13][C:12]([O:15][CH3:16])=[CH:11][CH:10]=1)[CH:22]=[O:23]5 g (36.1 mmol) of potassium carbonate and then 4.9 ml (36.1 mmol) of 1-chloromethyl-4-methoxy-benzene are added to a solution of 5 g (33 mmol) of 4-hydroxy-3-methoxy-benzaldehyde in 100 ml of acetone. The reaction mixture is then stirred at 55° C. for 28 hours and then filtered. The filtrate is concentrated under vacuum. The residue obtained is taken up in heptane and filtered. 8.9 g (100%) of 3-methoxy-4-(4-methoxy-benzyloxy)-benzaldehyde is obtained in the form of a beige solid.
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