二氧戊环是具有化学式（CH2）2O2CH2的杂环缩醛.它与四氢呋喃通过交换CH2基团的一种氧有关.相应的饱和6元C4O2环被称为二恶烷.异构体1,2-二氧杂环戊烷（其中两个氧中心相邻）是过氧化物.1,3-二氧杂环戊烷用作溶剂和聚缩醛中的共聚单体.
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