Cyclopropenylidene

Cyclopropenylidene, or c-C3H2, is a partially aromatic molecule belonging to a highly reactive class of organic molecules known as carbenes. On Earth, cyclopropenylidene is only seen in the laboratory due to its reactivity. However, cyclopropenylidene is found in significant concentrations in the interstellar medium (ISM) and on Saturn's moon Titan. Its C2v symmetric isomer, propadienylidene (CCCH2) is also found in the ISM, but with abundances about an order of magnitude lower. A third C2 symmetric isomer, propargylene (HCCCH), has not yet been detected in the ISM, most likely due to its low dipole moment.

Cyclopropenylidene
Names
Preferred IUPAC name
Cycloprop-2-en-1-ylidene
Identifiers
3D model (JSmol)
ChemSpider
PubChem CID
  • InChI=1S/C3H2/c1-2-3-1/h1-2H
    Key: VVLPCWSYZYKZKR-UHFFFAOYSA-N
  • InChI=1/C3H2/c1-2-3-1/h1-2H
    Key: VVLPCWSYZYKZKR-UHFFFAOYAY
SMILES
  • C1=C[C]1
Properties
C3H2
Molar mass 38.049 g·mol−1
Conjugate acid Cyclopropenium ion
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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