Definition

Noun: - A univalent chemical radical derived from ethylene: A specific, reactive group of atoms (a radical) that forms part of many larger molecules. It is characterized by the structure H₂C=CH– and is derived from ethylene (ethene).

Usage

• This term is used almost exclusively in technical, scientific contexts such as organic chemistry, polymer science, and materials engineering.
• It refers to the fundamental molecular unit that, when repeated, forms the polymer polyvinyl chloride (PVC) and is part of other vinyl compounds.

Examples

• The vinyl radical is the essential building block for creating PVC plastics.
• In this reaction, the molecule attaches via a vinyl radical.
• The stability of the vinyl radical influences the polymerization process.

Advanced Usage

• In advanced chemical nomenclature, the term is synonymous with the "ethenyl" group, though "vinyl" remains the common industrial and historical term.
• It is often discussed in the context of free-radical polymerization, where vinyl radicals are key reactive intermediates.

Variants and Related Words

• Vinyl (noun/adjective): Commonly refers to materials (like PVC records or flooring) made from polymers of vinyl compounds, or more broadly to compounds containing the vinyl radical.
  • The chemist works with vinyl monomers.
  • I found an old vinyl record.
• Vinyl polymer (noun): A polymer where the repeating unit is derived from a vinyl compound (e.g., polyethylene, PVC, polystyrene).
• Vinyl compound (noun): Any organic compound that contains the vinyl radical, such as vinyl chloride (H₂C=CHCl).

Synonyms

• Ethenyl group: The systematic IUPAC name for the vinyl radical.
• CH₂=CH– group: A structural representation of the radical.

Notes on Meaning

• The term "vinyl radical" is highly specific. In everyday language, the word "vinyl" alone almost never refers to this chemical radical but to the plastic material made from its polymers.
• It is a radical, meaning it has one bonding site to attach to another atom or group within a molecule.

Noun

1. a univalent chemical radical derived from ethylene