Catalytic synthesis of citral diethyl acetal by supported strong acid;

Phase transfer catalyst was used for synthesis of citral diethyl acetal, the yield has increased.

The new method for catalytic synthesis of citral dimethyl acetal from composite supported acid(ph-SO3H/CuSO4·Na2SO4·CaSO4) of absorb water by itself is studied,and to solve the difficult problem of separated water in condensation reaction from citra and methnol.

Reaction of citric acid with paraformaldehyde gave anhydromethylene citric acid(Ⅰ) with a yield of 63%;the reaction of compound(Ⅰ) with acetic anhydride gave the corresponding anhydride(Ⅱ) with a yield of 87%;the esterification of compound(Ⅱ) with lauryl alcohol gave anhydrocitric acid monoester(Ⅲ) with a yield of 76%.