An organic molecule in which an oxygen atom is bonded to two carbon atoms through two sigma bonds is known as an ether. Ether molecules occur widely in nature. Diethyl ether was once widely used as an anesthetic. An aromatic ether known as Nerolin II (2-ethoxynaphthalene) is used in perfumes to impart the scent of orange blossoms. Cyclic ethers, such as tetrahydrofuran, are commonly used as organic solvents. Although ethers contain two polar carbon-oxygen bonds, they are much less reactive than alcohols or phenols.
Epoxides are cyclic ethers that contain a three-membered ring. The simplest example is oxirane (ethylene oxide). An epoxide is one of the functional groups in the insect hormone known as juvenile hormone.
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