Ethers are synthesized by combining an alcohol and an olefin by a chemical reaction. The chemical name of the ether reflects the two starting materials. For example, ETBE is ethyl-tertiary-butyl ether and is synthesized by reaction of ethanol and isobutene. MTBE is methyl-tertiary-butyl ether, and is synthesized by reaction of methanol with isobutene. In case of the bio-ether, a bio-based alcohol is used.