Synthesis of α,β-unsaturated ketal(acetal);

The synthesis of ketal catalyzed with H_3PW_(12)O_(40) supported onto active carbon;

Synthesis of cyclohexanone pentaerythritol ketal catalyzed by iodinine supported on activated carbon;

A side reaction—ketalation usually occurs during the reaction and the weight percent of byproduct(Ⅴ) is 9.

Pentaerythritol diacetals and diketals from aromatic aldehydes,aliphatic aldehydes,α,β-unsaturated aldehydes and ketones were synthesized using methanesulfonic acid as catalyst in cyclohexane under reflux temperature.