https://doi.org/10.1351/goldbook.C00804
Generic name for anions containing an even number of electrons and having an unshared pair of electrons on a tervalent carbon atom (e.g. Cl3C− or HC≡C− ) or — if the ion is mesomeric (see @[email protected]) — having at least one significant @[email protected] with an unshared pair of electrons on a tervalent carbon atom, for example:
C00804-1.png
See also:
radical ion