Triafulvalene or cyclopropenylidenecyclopropene is a fulvalene hydrocarbon with chemical formula C₆H₄, composed of two linked cyclopropene rings. Triafulvalene has never been isolated, since it can decompose via an isodesmic reaction. However, this molecule is of theoretical significance for theoretical organic chemists, and its structure, stability, and spectral properties are well-studied.

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{{theoretical-chem-stub Fulvalenes Hypothetical chemical compounds Cyclopropenes

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