Acetic Acid → 2-Propenal, 3-[4-(1,1-dimethylethyl)phenyl]-2-methyl-

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108.5 g of p-tert.butyl-benzaldehyde are added under nitrogen gasification to a solution of 1.4 g of potassium hydroxide in 100 ml of methanol and 39.2 g of propionaldehyde are subsequently added dropwise at 40° C. over a period of 6 hours. Subsequently, the mixture is further stirred at 40° C. for 1 hour, 1.5 ml of acetic acid are added and the mixture is concentrated on a rotary evaporator. The oily suspension is taken up in ether, washed neutral with water, dried and evaporated. By distillation there is obtained pure 3-(p-tert.butyl-phenyl)-2-methyl-acrolein of boiling point 165° C./11 Torr.

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