Propalene

Propalene or bicyclo[1.1.0]buta-1,3-diene is a polycyclic hydrocarbon composed of two fused cyclopropene rings.^[1][2] Computational studies indicate that the molecule is planar, with the carbon framework forming a parallelogram that has distinctly alternating short and long carbon–carbon bonds.^[3]

Propalene

Names
Preferred IUPAC name Bicyclo[1.1.0]buta-1,3-diene
Other names Propalene, Bicyclobutadiene
Identifiers
CAS Number	13969-14-7 Y
3D model (JSmol)	Interactive image
ChemSpider	35806075
PubChem CID	20577920
CompTox Dashboard (EPA)	DTXSID90608913
InChI InChI=1S/C4H2/c1-3-2-4(1)3/h1-2H Key: QYGHRDRLUMAIGS-UHFFFAOYSA-N
SMILES C1=C2C1=C2
Properties
Chemical formula	C4H2
Molar mass	50.060 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N (what is YN ?) Infobox references

See also

• Butadiene
• Cyclobutadiene
• Bicyclobutane
• Butalene
• Pentalene
• Heptalene
• Octalene