[OH:1][C:2]1[CH:9]=[CH:8][C:5]([CH:6]=[O:7])=[CH:4][CH:3]=1.[I-].[K+].CC(C)([O-])C.[K+].[CH3:18][O:19][CH2:20][CH2:21]Cl>CN(C=O)C>[CH3:18][O:19][CH2:20][CH2:21][O:1][C:2]1[CH:9]=[CH:8][C:5]([CH:6]=[O:7])=[CH:4][CH:3]=1146.5 g (1.2 mol) of 4-hydroxybenzaldehyde are dissolved in DMF, and 20 g (0.12 mol) of potassium iodide, 134.6 g (1.2 mol) of potassium tert-butoxide and 170.2 g (1.8 mol) of 2-chloroethyl methyl ether are added. The reaction mixture is stirred at 80° C. for 16 h. For work-up, the reaction mixture is concentrated under reduced pressure. The residue is taken up in 1 l of ethyl acetate and extracted with 0.5 l of 1N aqueous sodium hydroxide solution. The ethyl acetate phase is dried using magnesium sulphate and concentrated under reduced pressure. The residue obtained after concentration is distilled under high vacuum (b.p.=100° C. at 0.45 mbar). This gives 184.2 g (85% of theory) of product.
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