反应详情

504 g of a solution of 240 g of propionaldehyde in 264 g of diethoxyacetaldehyde (glyoxal(mono)diethylacetal) are run into a mixture of 48 g of dimethylamine in 72 g of water and 80 g of propionic acid at 40° C. in the course of 30 minutes, while stirring. The reaction mixture is then stirred for a further 3 hours. After the lower aqueous phase has been separated off, fractional distillation of the organic phase gives 237 g (68.9% of theory) of 2-methyl-4,4-diethoxybut-2-enal of boiling point 67°-69° C./8 mbar.

1. stirringThe reaction mixture is then stirred for a further 3 hours
2. customAfter the lower aqueous phase has been separated off
3. distillationfractional distillation of the organic phase