Allylic

A carbon adjacent to a C-C pi bond is called an “allylic” carbon. Allylic carbocations, radicals, and carbanions are more stable than those arising from typical aliphatic carbons.

A related term is benzylic, which refers to the carbon directly adjacent to a benzene ring.

Not to be confused with vinylic, which refers to an sp2 carbon directly incorporated into a double bond.

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