Phosphoric Acid → 3-Methyl-2-butenal

Participants

Reaction Conditions

Reaction Steps

0.4 part of 75 percent strength aqueous phosphoric acid is added to 69.2 parts of 3-methyl-3-buten-1-al and the mixture is heated in a pressure vessel to 140° C. in the course of 5 minutes, whilst bringing the total pressure to 10 bars with nitrogen. After 70 minutes at the above temperature, the mixture is cooled to room temperature in the course of 5 minutes. After neutralizing the phosphoric acid, distillation at 100 mm Hg gives 4.2 parts of uncoverted 3-methyl-3-buten-1-al and 61.8 parts (95% of theory) of 3-methyl-2-buten-1-al of boiling point 77° C. This corresponds to a conversion of 94 percent.

Provenance & Evidence