Alkenyl refers to a type of hydrocarbon group that contains a carbon-carbon double bond (C=C) and is derived from alkenes. These groups are characterized by the presence of at least one double bond between carbon atoms, which gives them unique chemical properties. Alkenyl groups are often represented as R-CH=CH2, where R is a substituent. Alkenyl compounds are important in organic chemistry and are commonly found in various natural and synthetic substances. They play a crucial role in the production of polymers, such as polyethylene, and are also involved in many chemical reactions, including addition reactions and polymerization.