C5H6
66.1 g/mol
Industrial ChemicalDanger
Cyclopentadiene
CAS542-92-7EC208-835-4
Category
Industrial Chemical
Compound Class
Other
Primary Use
Diene in Diels-Alder reactions
Cyclopentadiene is an organic compound with the formula C5H6, often abbreviated as CpH. It is primarily significant as a diene in Diels-Alder reactions, a key transformation in organic synthesis.
Diene in Diels-Alder reactions
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
StrongStructure SimilarSimilarity 0.89
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Chemical intermediate
Referencesame scaffold
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Referencesame scaffold
Pentamethylcyclopentadiene
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Referencesame scaffold
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precursor for cyclopentadienyl ligands
Safety Reference
Danger
H225Highly flammable liquid and vapour
H226Flammable liquid and vapour
H301Toxic if swallowed
H311Toxic in contact with skin
H312Harmful in contact with skin
H315Causes skin irritation
H319Causes serious eye irritation
H332Harmful if inhaled
H335May cause respiratory irritation
H317May cause an allergic skin reaction
H336May cause drowsiness or dizziness
H370Causes damage to organs
H373May cause damage to organs through prolonged or repeated exposure
Regulatory Compliance1
- CN Catalogue of Hazardous ChemicalsCNRegulation
Customs Tariff Classification
The international HS code for Cyclopentadiene (CAS 542-92-7) is 2902.19.
HS code (international, 6-digit)
2902.19
EU CN code (8-digit)
2902 19 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
cyclopenta-1,3-diene
InChIKey
ZSWFCLXCOIISFI-UHFFFAOYSA-N
SMILES
C1C=CC=C1
Synonyms (8)
- 1,3-CYCLOPENTADIENE
- Cyclopentadiene
- Pentole
- Pyropentylene
- R-Pentine
- cyclopenta-1,3-diene
- cyclopentadien
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