different between annulene vs annulenylidene

English

annulene (plural annulenes)

(organic chemistry) Any monocyclic hydrocarbon, of general formula C_nH_n (where n is even), or C_nH_n+1 (where n is odd).

If n is greater than 6 (benzene) they are named [n]annulene e.g. [9]annulene.

annulenylidene (plural annulenylidenes)

(organic chemistry) Any carbene derived from an odd-numbered annulene by conversion of the CH₂ group to C:

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