Molecular properties
- Formula
- C5H8
- Molar mass
- 68.12 g·mol−1
- Exact mass
- 68.0626 Da
- 2
- 0
- 0
- 0.00 Ų
- 1.9 (PubChem computed XLogP3-AA descriptor)
- CAS
- 142-29-0
- PubChem CID
- 8882
Molecule record
CYCLOPENTENE
C5H8
68.12 g/mol
Interactions
- Polarity
- Often weakly polar or nonpolar unless other structural features dominate.
- Acid-base behavior
- Review ionizable groups and pKa data where available; ChemForge does not infer definitive acid-base state from identity alone.
- Intermolecular forces
- Assess dispersion, dipole interactions, hydrogen bonding, and ionic character from the functional groups shown.
Functional groups
Alkene
Aromatic ring
Physical properties
| Property | Value | Conditions | Source |
|---|---|---|---|
| Logp | 1.9 | PubChem computed XLogP3-AA descriptor | PubChem(link only) |
Common names and synonyms
- 1-Cyclopentene
- 1-Cyclopentene #
- 142-29-0
- 205-532-9
- 29300-20-7
- C5H8
- CHEBI:49155
- Cyclopentene, 96%
Show all 22 synonyms
- DTXCID609171
- DTXSID6029171
- EC 205-532-9
- EINECS 205-532-9
- InChI=1/C5H8/c1-2-4-5-3-1/h1-2H,3-5H
- LPIQUOYDBNQMRZ-UHFFFAOYSA-N
- MFCD00001394
- NSC 5160
- NSC-5160
- ONM2CKV81Z
- RefChem:129879
- UN2246
- UNII-ONM2CKV81Z
- WLN: L5UTJ
Structure identifiers
- Canonical SMILES
- C1CC=CC1
- Isomeric SMILES
- C1CC=CC1
- InChI
- InChI=1S/C5H8/c1-2-4-5-3-1/h1-2H,3-5H2
- InChIKey
- LPIQUOYDBNQMRZ-UHFFFAOYSA-N
- PubChem CID
- 8882
Spectroscopy
Tabs appear only for spectra stored with clear provenance.
Simulated FTIR trace
Predicted FTIR / %T
4 cm-1 resolution / deterministic instrument profile
Hover for cursor
Peak assignments
1645 cm−1C=C alkene (simulated)
3030 cm−1aromatic C-H (simulated)
1600 cm−1aromatic C=C (simulated)
2960 cm−1sp3 C-H (simulated)
Simulated NMR
On-demand educational prediction for CYCLOPENTENE; not experimental data.
Simulated EI mass spectrum
On-demand educational fragmentation for CYCLOPENTENE; not experimental data.
Sources
Molecule identity
Retrieved 8/7/2026. Reuse status is summarized by the badge; open the source for full details.
simulated IR
ChemForge original educational simulation.