Alkeeniyyliryhmä

Alkeeniyyliryhmä refers to a functional group in organic chemistry derived from an alkene by the removal of a hydrogen atom from one of the doubly bonded carbon atoms. The general formula for an alkeenyl group is CnH2n-1, where n is an integer greater than or equal to 2. These groups are characterized by the presence of a carbon-carbon double bond within their structure.

The nomenclature of alkeenyl groups is typically based on the parent alkene. For example, the vinyl group, with the formula CH2=CH-, is derived from ethene. The allyl group, CH2=CH-CH2-, is derived from propene. The position of the double bond within the group is crucial and is indicated by numbering. If the double bond is not at the terminal position, a prefix indicating the position of the double bond is used.

Alkeenyl groups are important building blocks in organic synthesis. They can participate in a variety of reactions, including addition reactions across the double bond, electrophilic substitution, and polymerization. Their presence in a molecule can significantly influence its reactivity and physical properties. Many natural products and synthetic polymers contain alkeenyl moieties.