https://doi.org/10.1351/goldbook.08905
Polymers composed of macromolecules containing exclusively ethene-1,2-diyl (formerly vinylene) or substituted ethene-1,2-diyl constitutional repeating units in the backbone: \[\ce{-CR^{1}=CR^{2}-}\] where \(\ce{R^{1}}\) and \(\ce{R^{2}}\) are each hydrogen or an alkyl, aryl, or heteroaryl group (structure-based polymer class name).
Notes:
- Delocalization of electrons in conjugated chains gives to main-chain single bonds a partial character of double bonds, which restrict free rotations around these bonds which, therefore, show the cis-trans like isomerism. Four basic stereoregular polyvinylene chains can be derived:
- Polyvinylenes are almost exclusively prepared by polymerization of acetylene derivatives. Therefore, based on the source, they are mostly polyacetylenes.
Example: Polyvinylenes and their structure-based (first row) and source-based (second raw) names are: