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Encyclopedic overview
Chemical structure of the vinyl functional group.
In organic chemistry, a vinyl group (abbr. Vi; IUPAC name: ethenyl group) is a functional group with the formula −CH=CH2. It is the ethylene (IUPAC name: ethene) molecule (H2C=CH2) with one fewer hydrogen atom. The name is also used for any compound containing that group, namely R−CH=CH2 where R is any other group of atoms.
Excerpted from Wikipedia’s “vinyl” article, available under the CC BY-SA 4.0 licence.