Enol ether

Enol ether

An enol ether is an alkene with an alkoxy substituent. The general structure is R_1R_2C=CR_3-O-R_4 with R an alkyl or an aryl group. Enol ethers and enamines are so-called activated alkenes or electron rich alkenes because the oxygen atom donates electrons to the double bond by forming a resonance structure with the corresponding oxonium ion. This property makes them reactive substrates in certain organic reactions such as the Diels-Alder reaction. An enol ether can be considered the ether of the corresponding enolate, hence the name. Two simple enol ethers are "ethyl vinyl ether" and "2,3-dihydrofuran".


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