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The three isomers of dioxane.
Small blue numbers show numbering of atoms in rings.

1,3-Dioxane or m-dioxane is a chemical compound with the molecular formula C4H8O2, the CAS number 505-22-6 , EC Number 208-005-1 and RTECS JG8224000.[1]

1,3-Dioxanes and 1,3-dioxolanes are prepared from carbonyl compounds with 1,3-propanediol or 1,2-ethanediol in the presence of Brönsted or Lewis acid catalysts.

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