Enol ether

An enol ether is a type of organic compound. They are ethers where the oxygen atom is next to a double bond between carbon atoms.

 Preparation 
Unlike other ethers, it is hard to make enol ethers using the Williamson ether synthesis. Enols are unstable versus changing into ketones, and vinyl halides are the wrong shape for the SN2 mechanism. Instead, enol ethers are normally made with an addition reaction between a terminal alkyne and an alcohol, using a strong base as a catalyst. A second route is transesterfication of vinyl acetate using transition metal catalysts.

 Sources 

Category:Functional groups