C(=O)([O-])[O-].[K+].[K+].[I-].[K+].[O:9]([C:16]1[CH:21]=[CH:20][C:19]([OH:22])=[CH:18][CH:17]=1)[C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1.[CH2:23]([O:25][CH:26]([O:29][CH2:30][CH3:31])[CH2:27]Br)[CH3:24]>CN(C)C=O>[CH2:23]([O:25][CH:26]([O:29][CH2:30][CH3:31])[CH2:27][O:22][C:19]1[CH:18]=[CH:17][C:16]([O:9][C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=2)=[CH:21][CH:20]=1)[CH3:24]150 g of potassium carbonate and 4 g of finely powdered potassium iodide are added to a solution of 112 g (0.6 mole) of 4-phenoxyphenol and 157.6 g (0.8 mole) of bromoacetaldehyde diethyl acetal in 480 ml of dimethylformamide, and the batch is heated, under nitrogen, for 14 hours at 150° C. The salts are then removed by filtration from the reaction solution, and most of the dimethylformamide is distilled off in a water jet vacuum. The residue is dissolved in ether and the resultant solution is washed twice with water, three times with 20% potassium hydroxide solution and again with water. The ethereal solution is then dried over sodium sulfate and the ether is distilled off entirely. The resultant 4-phenoxyphenoxyacetaldehyde diethyl acetal is used without further purification for the preparation of the free aldehyde.
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