different between heterocumulene vs cumulene

English

hetero- +? cumulene

heterocumulene (plural heterocumulenes)

(organic chemistry) Any compound formally derived from a cumulene by replacing one or more carbon atoms of the cumulative bond system by another atom e.g. O=C=C=C=O

cumulene (plural cumulenes)

(organic chemistry) Any hydrocarbon (or derivative) having three or more cumulative double bonds e.g. R₂C=C=C=CR₂

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