Allyl

An allyl group is a substituent with the structural formula H₂C=CH-CH₂R, where R is the connection to the rest of the molecule. It is made up of a methylene (-CH₂-), attached to a vinyl group (-CH=CH₂). The name is derived from the Latin word for garlic, Allium sativum. In 1844, Theodor Wertheim isolated an allyl derivative from garlic oil and named it "Schwefelallyl." The term allyl applies to many compounds related to H₂C=CH-CH₂, which includes thousands of different chemical compounds, some of which are of practical or everyday importance.