vinylici

Vinylic compounds are organic molecules in which a vinyl group, originated from ethene, is a central structural element. The term vinylic describes atoms or substituents connected directly to one of the carbons of a carbon–carbon double bond (the sp2 carbons). The vinyl group is commonly represented as –CH=CH2 when used as a substituent, or as CH2=CH– in some contexts, with the rest of the molecule attached to a vinylic carbon.

Typical examples include vinyl chloride (CH2=CHCl), vinyl acetate (CH2=CHOCOCH3), and styrene (C6H5–CH=CH2). These compounds are foundational in polymer chemistry; many vinyl monomers undergo free-radical or anionic polymerization to give polymers such as polyvinyl chloride (PVC), polyvinyl acetate, and polystyrene.

Chemical behavior of vinylic compounds differs from allylic systems. The C=C bond undergoes usual alkene-type reactions, such as electrophilic or radical additions, but vinylic carbons are less prone to certain reactions (for example, nucleophilic substitution at a vinylic carbon is challenging without harsh conditions). Vinylic hydrogens are relatively nonacidic, and vinylic carbons bear substantial double-bond character that affects reactivity and stability of intermediates such as vinylic cations.

Applications of vinylic compounds are widespread in plastics, coatings, and specialty chemicals. Safety and handling vary by compound, with some vinyl chlorides and related materials requiring strict controls due to toxicity or environmental concerns. The term emphasizes the molecular fragment directly participating in the carbon–carbon double bond and its immediate chemical behavior.