Halogenated ethers are a subcategory of ethers—organic chemicals that contain an oxygen atom connected to two alkyl groups or similar structures. An example of an ether is the solvent diethyl ether.[1] Halogenated ethers differ from other ethers because there are one or more halogen atoms—fluorine, chlorine, bromine, or iodine—as substituents on the carbon groups. .[2] Examples of commonly used halogenated ethers include isoflurane, sevofluorane and desflurane.[3]