[CH:1](=[O:4])[CH2:2][CH3:3].[C:5]1([CH:11]([CH3:14])[CH:12]=O)[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1.[OH-].[Na+].C(O)(=O)C>CO>[CH3:3][C:2](=[CH:12][CH:11]([CH3:14])[C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1)[CH:1]=[O:4]192 g of propionaldehyde are added dropwise to a solution of 402 g of 2-phenylpropan-1-al and 12 g of sodium hydroxide in 1 l of methanol in the course of 6 hours. Stirring is continued for one hour, after which the mixture is neutralized with glacial acetic acid (pH=6), stirred overnight and evaporated down, the residue is taken up with CH2Cl2 /H2O, and the solution is extracted with CH2Cl2. The organic phase is washed with water, dried over Na2SO4, evaporated down again and distilled to give 178 g of 2,4-dimethyl-4-phenylbut-2-en-1-al of boiling point 108°-120° C./0.5 mbar.
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