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Names | |||
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Preferred IUPAC name
Cyclobuta-1,3-diene | |||
Other names
1,3-Cyclobutadiene
Cyclobutadiene [4]Annulene | |||
Identifiers | |||
3D model (JSmol)
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ChEBI | |||
ChemSpider | |||
PubChem CID
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UNII | |||
CompTox Dashboard (EPA)
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Properties | |||
C4H4 | |||
Molar mass | 52.076 g·mol−1 | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Cyclobutadiene is an organic compound with the formula C4H4. It is very reactive owing to its tendency to dimerize. Although the parent compound has not been isolated, some substituted derivatives are robust and a single molecule of cyclobutadiene is quite stable. Since the compound degrades by a bimolecular process, the species can be observed by matrix isolation techniques at temperatures below 35 K. It is thought to adopt a rectangular structure.[1][2]