Cyclopropatriene
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Cyclopropatriene is a
hypothetical compound A hypothetical chemical compound is a chemical compound that has been conceived of, but is not known to have been synthesized, observed, or isolated (identified or shown to exist). Some hypothetical compounds cannot form at all. Others might tur ...
() which is an
allotrope of carbon Carbon is capable of forming many allotropy, allotropes (structurally different forms of the same element) due to its Valence (chemistry), valency. Well-known forms of carbon include diamond and graphite. In recent decades, many more allotrope ...
. It was once proposed as a candidate for a spectroscopically observed
tricarbon Tricarbon (systematically named 1λ2,3λ2-propadiene and ''catena''-tricarbon) is an inorganic compound with the chemical formula (also written (μ-C)Cor ). It is a colourless gas that only persists in dilution or solution as an adduct. It is ...
species. It is a cyclic
cumulene In organic chemistry, a cumulene is a compound having three or more ''cumulative'' (consecutive) double bonds. They are analogous to allenes, only having a more extensive chain. The simplest molecule in this class is butatriene (), which is also ...
.


References

Allotropes of carbon Hypothetical chemical compounds Three-membered rings Homonuclear triatomic molecules {{theoretical-chem-stub