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EINECS 205-532-9
CAS No. 142-29-0 Density 0.831 g/cm3
PSA 0.00000 LogP 1.72650
Solubility immiscible with water Melting Point -135 °C
Formula C5H8 Boiling Point 44.2 °C at 760 mmHg
Molecular Weight 68.13 Flash Point <−30°F
Transport Information UN 2246 3/PG 2 Appearance colourless liquid with a petrol-like odour
Safety 9-16-26-33-36-62-61-36/37 Risk Codes 11-21/22-36/37/38-65-67-52/53
Molecular Structure Molecular Structure of 142-29-0 (Cyclopentene) Hazard Symbols FlammableF,HarmfulXn



Cyclopentene Chemical Properties

Product Name: Cyclopentene (CAS NO.142-29-0)

Molecular Formula: C5H8
Molecular Weight: 68.117
Index of Refraction: 1.464
Molar Refractivity: 22.66 cm3
Molar Volume: 82 cm3
Surface Tension: 29.7 dyne/cm
Density: 0.83 g/cm3
Enthalpy of Vaporization: 27.63 kJ/mol
Boiling Point: 44.2 °C at 760 mmHg
Vapour Pressure: 378 mmHg at 25°C 
Appearance: colorless liquid with a petrol-like odor
XLogP3-AA: 1.9
H-Bond Donor: 0
H-Bond Acceptor: 0
Structure Descriptors of Cyclopentene (CAS NO.142-29-0):
  IUPAC Name: cyclopentene
  Canonical SMILES: C1CC=CC1
  InChI: InChI=1S/C5H8/c1-2-4-5-3-1/h1-2H,3-5H2 
Product Categories: Pharmaceutical Intermediates; Alkenes; Cyclic; Organic Building Blocks

Cyclopentene Uses

 Cyclopentene (CAS NO.142-29-0) is  used as a monomer for synthesis of plastics, and in a number of chemical syntheses.

Cyclopentene Production

 It can be obtained from vinylcyclopropane in the vinylcyclopropane-cyclopentene rearrangement.

Cyclopentene Toxicity Data With Reference


orl-rat LD50:1656 mg/kg

    AIHAAP    American Industrial Hygiene Association Journal. 30 (1969),470.

skn-rbt LD50:1231 mg/kg

    AIHAAP    American Industrial Hygiene Association Journal. 30 (1969),470.

Cyclopentene Consensus Reports

Reported in EPA TSCA Inventory.

Cyclopentene Safety Profile

Moderately toxic by ingestion and skin contact. A very dangerous fire hazard when exposed to flame or heat; can react with oxidizing materials. Keep away from heat and open flame. To fight fire, use foam, CO2, dry chemical.
Hazard Codes: FlammableF,HarmfulXn
Risk Statements: 11-21/22-36/37/38-65-67-52/53
R11:Highly flammable. 
R21/22:Harmful in contact with skin and if swallowed. 
R36/37/38:Irritating to eyes, respiratory system and skin. 
R65:Harmful: may cause lung damage if swallowed. 
R67:Vapours may cause drowsiness and dizziness. 
R52/53:Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
Safety Statements: 9-16-26-33-36-62-61-36/37 
S9:Keep container in a well-ventilated place.
S16:Keep away from sources of ignition. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S33:Take precautionary measures against static discharges. 
S36:Wear suitable protective clothing. 
S62:If swallowed, do not induce vomitting; seek medical advice immediately and show this container or label. 
S61:Avoid release to the environment. Refer to special instructions / safety data sheets. 
S36/37:Wear suitable protective clothing and gloves.
RIDADR: UN 2246 3/PG 2
WGK Germany: 3
RTECS: GY5950000
F: 10-23
HazardClass: 3
PackingGroup: II

Cyclopentene Standards and Recommendations

DOT Classification:  3; Label: Flammable Liquid

Cyclopentene Specification

The Cas Register Number of  Cyclopentene is 142-29-0 .The chemical synonyms of  Cyclopentene (CAS NO.142-29-0) are 3-cyclopentene cyclopentene ; Cyclopentene ; 1-Cyclopentene ; Cyclopent-1-ene . 

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