Allyl

Part of speech: noun

Definitions

1. A chemical group derived from propene, featuring a vinyl group attached to a methylene bridge, often involved in reactions acting as an intermediate or substituent
2. An organic molecular fragment consisting of a carbon-carbon double bond adjacent to a single bonded carbon, commonly found in various hydrocarbons and used in synthetic chemistry
3. A structural component in organic compounds characterized by a double bond on one carbon that is directly bonded to another carbon atom, frequently utilized in polymer and pharmaceutical synthesis

Etymology: Allyl comes from garlic, by way of a Latin word for garlic. The Latin "allium" meant garlic, and English chemists took that stem and added the suffix "-yl," a standard ending for naming chemical radicals (groups of atoms that behave as a unit within a larger molecule). The name points to the compound first isolated from garlic oil, which is where the group got its label. The Latin "allium" itself has a long road behind it. Its ultimate ancestry is uncertain, though it is often linked to a Proto-Indo-European root for pungent smells. Latin passed it along to the Romans as the everyday word for their pungent bulb, and it is the same stem that gives English words like "garlic" in its scientific dress.

Synonyms: allylic radical, allyl group