text: *Benzylidene acetal and acetonide, protecting groups
  *Dimethoxymethane, a solvent, a.k.a. methylal, a.k.a. formal [ambiguous]
  *Dioxolane
  *Metaldehyde
  *Paraldehyde
  *1,3,5-Trioxane
  *Phenylsulfonylethylidene (PSE) acetal is an example of arylsulfonyl acetal possessing atypical properties, like resistance to acid hydrolysis which leads to selective introduction and removal of the protective group.
  *Most glycosidic bonds in carbohydrates and other polysaccharides are acetal linkages.
  **Cellulose is a ubiquitous example of a polyacetal.
  Although many compounds contain an acetal functional group, at least two acetal compounds are called "acetal" for short:
  *Polyoxymethylene (POM) plastic, also known as "acetal" or "polyacetal", is a polyacetal (and a polyether), and a polymer of formaldehyde.
  *1,1-Diethoxyethane (acetaldehyde diethyl acetal), sometimes called simply "acetal", is an important flavouring compound in distilled beverages.