Catalytic Synthesis of n-Butyraldehyde 1,2-propanediol Acetal over H4SiW12O40-PAn

A new environmentally friendly catalyst, H₄SiW₁₂O₄₀-polyaniline (PAn), was prepared, and n-butyraldehyde 1,2-propanediol acetal was synthesized from n-butyraldehyde and 1,2-propanediol in the presence of H₄SiW₁₂O₄₀-PAn. The influence factors of the synthesis were discussed, and the best reaction conditions were found: the molar ratio of n-butyraldehyde to 1,2-propanediol is 1:1.5, the amount of catalyst used is 1.2% of feed stock, and the reaction time is 1.0 h. H₄SiW₁₂O₄₀-PAn is an excellent catalyst for synthesizing n-butyraldehyde 1,2-propanediol acetal, and the yield can reach more than 95.2%. *Translated from Journal of Central China Normal University (Natural Sciences Edition), 2005, 39(9) (in Chinese), 2004, 28(4) (in Chinese)