反应详情

A mixture of 670 g (5 moles) of 2-methoxymethyl2-methyl-1,3-propanediol, 479 g (5.5 moles) of 85% strength methoxyacetaldehyde and 250 ml of chloroform was heated with 10 g of pyridinium p-toluenesulfonate under a water separator until water no longer separated off. The solution was deionized using a mixed-bed ion exchanger, the solvent was stripped off under reduced pressure and the residue was subjected to fractional distillation under reduced pressure. 864 g (91% yield) of 2,5-dimethoxymethyl-5-methyl-1,3-dioxane of boiling point 95° C./10 mbar were obtained.

1. customno longer separated off
2. distillationthe residue was subjected to fractional distillation under reduced pressure