Used primarily as a protecting group reagent in organic synthesis, particularly for aldehyde protection. Its main application lies in stabilizing reactive aldehyde functionalities during multi-step syntheses, allowing selective reactions at other sites in the molecule. It is favored for its ease of introduction under mild acidic conditions and efficient removal when needed, without disturbing other protected groups. Commonly applied in pharmaceutical and fine chemical manufacturing where precise functional group control is required. Also serves as an intermediate in the production of flavors and fragrances due to its stability and controlled reactivity.