Both detections were based on rotational constants for cyanoacetylene allene (or
hexa-4,5-diene-2-ynenitrile) measured by
McCarthy and co-workers.
In addition to cyanoacetylene allene, two other allenyl compounds have been detected to date,
cyanoallene and
allenyl diacetylene. The parent compound
propadiene (allene) doesn't have a dipole moment and is
thus cannot be detected via rotational transitions. Cyanoacetylene allene is also a member of the huge group
of detected CN-containing compounds.
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