allyl group
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substituent group referring to the allyl (or propenyl) group
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Encyclopedic overview
Structure of the allyl group
In organic chemistry, an allyl group is a substituent with the structural formula −CH2−HC=CH2. It consists of a methylene bridge (−CH2−) attached to a vinyl group (−CH=CH2). The name is derived from the scientific name 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, some of which are of practical or of everyday importance, for example, allyl chloride.
Excerpted from Wikipedia’s “allyl group” article, available under the CC BY-SA 4.0 licence.