An epoxide, also known as an oxirane, is a cyclic ether with a three-membered ring containing an oxygen atom. The ring strain in the three-membered ring makes epoxides highly reactive, allowing them to undergo ring-opening reactions. Epoxides are important monomers in polymer chemistry, used in the synthesis of epoxy resins, polyethers, and other polymers. They are also valuable intermediates in organic synthesis.

环氧化物，也称为氧丙环，是一种环醚，具有包含氧原子的三元环。三元环中的环应变使环氧化物具有高反应活性，使其能够进行开环反应。环氧化物是高分子化学中重要的单体，用于合成环氧树脂、聚醚和其他聚合物。它们也是有机合成中有价值的中间体。