heteroallene

== English == === Etymology === From hetero- +‎ allene. === Noun === heteroallene (plural heteroallenes) (organic chemistry) Any compound formally derived from an allene by replacing one or more carbon atoms of the cumulative bond system by another atom e.g. O=C=O (carbon dioxide) or CH2=C=O (ketene). ==== See also ==== heterocumulene