Noun
carbene (plural carbenes)
(organic chemistry) Any short-lived, reactive species R2C:, especially the parent compound CH2: (also called methylene).
Persistent carbenes The production of furoin from furfural is catalyzed by thiamine through a relatively stable carbene (an organic molecule containing unbonded valence electrons pairs at a carbon center). Source: Internet
The N-heterocyclic carbene ligand called IMes is a bulky ligand by virtue of the pair of mesityl groups. Source: Internet