Method of preparing 4,4-dimethyldioxane-1,3

Details Method of preparing 4,4-dimethyldioxane-1,3 Method of preparing 4,4-dimethyldioxane-1,3

C - Chemistry, Metallurgy

07

D

260/353.8

C07D 309/04 (2006.01)

Patent

CA 1037482

ABSTRACT The method of preparing 4,4-dimethyldioxane-1,3 consists in the interaction of isobutylene and formaldehyde in an aqueo medium at 90 to 115°C in the presence of a catalyst, in the capacity of which use is made of such inorganic salts of mine- ral acids that feature the pH value of their aqueous solutions falling within 2.2 to 4.5, resulting in the formation of an organic and an aqueous phases, containing the end product, followed by separation of said phases, washing the organic phase with water and isolation of the end product. When use is made as a catalyst, of the salts the acidity of the aqueous solutions of which is invariable or decreases with an increase in the salt concentration, it is expedient that the aqueous phase and the wash water be evaporated to a level of 85-90 percent to form a fraction, containing the unreacted formaldehyde, and a distillation residue which is in fact an oil bed and a salt bed, the latter, after having been separated, being returned for the stage of interaction of the starting reagents.

203780

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